Short answer: The best pool and spa supply St. Louis homeowners can get in 2026 comes from local, independent stores. Start with R&S Pool & Spa in Maryland Heights, which has a large parts warehouse, free water testing, in-house equipment repair and hot tub sales. Four Seasons Pool (St. Charles and Wentzville), Baker Pool & Spa (Chesterfield) and Pool King Recreation (South County and O’Fallon) are also worth a visit. If you live in Metro East, look at Munie Leisure in Swansea and Oasis Pool Center in Wood River.
This guide compares the pool and spa supply St. Louis pool and hot tub owners can visit in person. It covers chemicals, replacement parts, filters, salt systems, hot tubs, water testing, and the openings, closings and repairs that come with a Missouri swim season. We favored locally owned stores and left out the big national chains. Every store below had a live website and an operating storefront when we checked in October 2026.
Every fact on this page comes from the store’s own website or a public source, and we logged each source by URL. When a store publishes prices or water-chemistry targets, we quote them as published. When it doesn’t, we don’t guess. Google ratings are shown as of the noted date (October 2026) and aren’t part of the ranking. Hours, prices and brands change from season to season, so call before you drive across town.
Pool and spa supply St. Louis stores at a glance
| Rank | Store | Best for | What stands out | Based in |
|---|---|---|---|---|
| 1 | R&S Pool & Spa | Owners who need hard-to-find parts, repairs and a store that can also service the pool | Large parts warehouse, free water testing, in-house repair, Nordic and Marquis hot tubs, weekly service plans | Dorsett Rd., Maryland Heights |
| 2 | Four Seasons Pool | St. Charles County salt-pool owners and robotic cleaner owners | Two stores, salt cell testing and cleaning, cleaner repair bench, bulk chlorine refills in Wentzville | St. Charles and Wentzville |
| 3 | Baker Pool & Spa | West County owners who want detailed water analysis and pool-care classes | Free water analysis, Pool School, Jacuzzi hot tubs, swim spas and saunas | THF Blvd., Chesterfield |
| 4 | Pool King Recreation | Above-ground pool owners and non-chlorine (Baquacil) users | Doughboy pools, Caldera and FreeFlow hot tubs, Sustain, Baquacil and SimpleSalt water care | South County and O’Fallon |
| 5 | Mirage Spa Service and Supply | Sundance hot tub owners in Kirkwood and southwest County | Sundance Spas dealer, free pool and spa water testing, in-ground equipment service | Manchester Rd., Kirkwood area |
| 6 | Prestige Pools & Spas | In-ground pool owners who want a builder’s showroom and service department | Hot tub showroom, chemicals and equipment, liners, safety cover cleaning and storage | Watson Rd., South County |
| 7 | Just Pools, Inc. | Jefferson County owners who need liners, leak detection or equipment repair | Camera leak detection, pressure tests, Clear Result chemicals, Garden Leisure hot tubs | Arnold |
| 8 | Spas and More | Shoppers comparing hot tubs, swim spas and saunas | Master Spas dealer, filters, chemicals and parts, service and repair | Gravois Rd., Sunset Hills |
| 9 | Munie Leisure | Metro East owners who want a printed, detailed water test | Computerized water testing, online store with in-store pickup, Jacuzzi spas | Swansea, Ill. |
| 10 | Oasis Pool Center | Riverbend-area owners shopping for supplies, hot tubs or an above-ground pool | New retail store from a local pool builder, free water testing, Dynasty Spas | Wood River, Ill. |
How we ranked pool and spa supply stores in St. Louis
- Parts and equipment on the shelf. When a pump seal fails in July, the store that has the part today beats the one that has to order it. We gave credit to stores that stock pumps, filters, heaters, salt cells and replacement parts, not just chemicals and floats.
- Water testing. Free in-store water testing is the most useful service a pool store offers. Stores that publish what they test for (free and total chlorine, pH, alkalinity, calcium hardness, cyanuric acid, salt, phosphates) ranked higher.
- Repair and service. We looked for in-house repair benches for pumps and robotic cleaners, authorized warranty service, and service crews for openings, closings, liners and leaks.
- Hot tub sales and support. Many St. Louis families own a hot tub instead of, or along with, a pool. We noted which brands each store sells and services, and whether it stocks filters and covers.
- Local ownership and coverage. We favored independent, locally owned stores and spread the list across St. Louis County, St. Charles County, Jefferson County and Metro East.
- Clear information. Stores that post addresses, phone numbers, prices or care guidance on their own sites got the edge over those that don’t.
- Google ratings. Where we show a Google rating, it is as of the noted date (October 2026), and it isn’t part of the ranking.
The best pool and spa supply stores in St. Louis in 2026
1. R&S Pool & Spa
Best for: Owners who need hard-to-find parts, repairs and a store that can also service the pool.
R&S Pool & Spa calls itself a full-service swimming pool and spa supply store for the St. Louis area and eastern Missouri. It works from 12001 Dorsett Road in Maryland Heights (63043), just off the I-270 corridor, and its St. Louis pages say it has served the community since 1971. Its service area covers St. Louis City and County (Clayton, Ladue, Kirkwood, Des Peres, Frontenac, Webster Groves, Brentwood, Creve Coeur, Town & Country, Chesterfield, Fenton, Crestwood, Sunset Hills and Ellisville) plus Jefferson and St. Charles counties.
Parts are where R&S stands out. The company says it has one of the largest warehouses and selections in the Midwest, and that many of its manufacturers’ representatives have told it R&S keeps the largest inventory of pool parts in stock in the country. It is an authorized service center for numerous manufacturers, and it repairs equipment in-house, for its own customers and for many other St. Louis pool companies.
- Supplies: pool chemicals, pumps, filters, heaters, automatic cleaners, automation, liners and above-ground pools, plus spa filters, covers, cover lifters and spa chemicals.
- Water testing: free computerized testing for chlorine, pH, alkalinity, calcium hardness and cyanuric acid, with a treatment plan to take home.
- Repair: pumps, heaters (gas, electric and heat pump), filters, automation and spa control panels. R&S says its technicians average 21 years of experience and its staff has more than 200 years of combined experience.
- Hot tubs: authorized dealer for Nordic and Marquis hot tubs, with test soaks available. It stocks filters for Marquis, Nordic, Cal Spa, Hot Spring, FreeFlow and other brands, and says it can usually special-order others within a few business days. Replacement covers are measured and custom-made.
- Service: openings during its March to May opening season, closings, weekly service, in-ground liner replacement, pool automation, equipment installation and pool cover replacement.
- Service plans (published prices): Gold, bi-weekly with 13 visits and chemicals included, for $2,195. Gold+ adds the opening and closing for $3,195. Platinum, weekly with 22 visits, is $4,950. Platinum+ is $5,950. Elite, 40 weekly visits with winter service, opening, closing and priority on urgent repairs, is $8,250.
R&S also publishes plain-English hot tub guidance: keep spa pH between 7.2 and 7.8, bromine at 3 to 5 ppm or chlorine at 1 to 3 ppm, and drain and refill every three to four months. Rinse the filter every two weeks, soak it every three months and replace it every 12 to 18 months.
Why it’s #1: R&S combines a deep parts inventory, free water testing, an in-house repair shop, hot tub sales and published service-plan pricing under one roof, and it serves most of the metro. Phone: (314) 207-4108.
2. Four Seasons Pool
Best for: St. Charles County salt-pool owners and robotic cleaner owners.
Four Seasons Pool has been locally owned since 1980. It runs two stores: 1801 Ford Lane in St. Charles (63303) and 12614 Veterans Memorial Parkway in Wentzville (63385). It serves St. Charles, Wentzville, Troy, Warrenton and Chesterfield. Both stores carry chemicals, cleaning supplies, equipment, parts and test kits, and both offer in-store water testing.
Its in-store services page is one of the most detailed in the metro, with prices listed:
- Salt systems: salt cell cleaning, plus testing for Pentair and Hayward salt cells.
- Bulk chlorine: at the Wentzville store, you buy a 2.5-gallon jug once and then pay only for refills.
- Cleaner repair: a warranty repair station for Dolphin robotic cleaners, and service on Maytronics/Dolphin, Pentair, Hayward and Polaris cleaners ($75 diagnostic, then $25 for each additional hour).
- Pump repair: a $100 bench fee.
- Winter storage: off-season cleaning and storage for filter parts ($100 for a D.E. grid assembly, $50 for a cartridge, $140 for a System 3 cartridge) and summer cleaning and storage for safety covers ($250 mesh, $300 solid, $250 poly).
Its service crews also handle liners, Brickline plaster and renovations, salt chlorine generators, leak detection, openings, closings and weekly service. Military members and first responders get 10% off in-store. Phone: (636) 946-3112 (St. Charles) or (636) 327-7018 (Wentzville).
https://www.fourseasonspool.com/
3. Baker Pool & Spa
Best for: West County owners who want detailed water analysis and pool-care classes.
Baker’s roots go back to 1968, when Baker Pool & Supply started. The service department and retail store followed in the mid-1970s, and the family-owned company became Baker Pool & Spa, Inc. in 1992. Its store is at 6 THF Blvd in Chesterfield (63005), in the Chesterfield Valley. Baker lists St. Charles, St. Peters, O’Fallon, Wentzville, Fenton, Union, Pacific and Washington among the areas it serves.
Its free water analysis is the reason to visit. Bring in a sample and Baker tests free and total chlorine, alkalinity, phosphates, salt and total dissolved solids, then recommends what to add. Its own guidance is to keep phosphates below 125 ppb, keep salt pools between 2,700 and 3,400 ppm, and test at least once every two weeks. Baker also runs Pool School for new owners and repairs pool cleaners. It sells pool and hot tub covers, including custom safety covers.
On the spa side, Baker sells Jacuzzi hot tubs, swim spas and saunas, plus Kodiak cold plunges, and offers test soaks. Phone: (636) 532-3133 (store).
4. Pool King Recreation
Best for: Above-ground pool owners and non-chlorine (Baquacil) users.
Pool King opened its first store in 1981 and is still family-owned. It has two locations: 2216 Lemay Ferry Road in South County (63125) and 389 McDonald Lane in O’Fallon, Mo. (63366). It sells Doughboy above-ground and semi in-ground pools, Caldera and FreeFlow hot tubs, swim spas and cold plunges, and it is an authorized Caldera and FreeFlow warranty service provider. Its technicians are employees, not subcontractors, and it serves both Missouri and Illinois.
For water care, Pool King carries Sustain (it says it has been an exclusive partner for more than 30 years), Baquacil and SimpleSalt (it says it’s the exclusive St. Louis dealer), along with its own SPARCO chemical line. Both stores offer free water testing, stock thousands of parts and take drop-off repairs on pumps and cleaners they sell. They also stock replacement liners for above-ground pools. Phone: (314) 487-6567 (South County) or (636) 240-5649 (O’Fallon).
5. Mirage Spa Service and Supply
Best for: Sundance hot tub owners in Kirkwood and southwest County.
Mirage Spa Service and Supply has been family owned and operated since 1988. It’s at 10831 Manchester Road (63122), in the Kirkwood area, and it is an exclusive Sundance Spas dealer that also sells swim spas and cold plunges. The store offers free pool and spa water testing and carries pool and spa chemicals.
Mirage isn’t only a hot tub shop. Its service department works on in-ground pool equipment: pumps and motors, sand, cartridge and D.E. filters, gas, electric and heat pump heaters, salt cells and automation. It lists store hours of Monday through Friday, 9 a.m. to 5 p.m., and Saturday, 10 a.m. to 4 p.m. Phone: (314) 965-0660.
6. Prestige Pools & Spas
Best for: In-ground pool owners who want a builder’s showroom and service department.
Prestige Pools & Spas has been building pools since 1985 and says it has built more than 3,000 of them. Its showroom is at 10416 Watson Road (63127) in South County, and it is open Monday through Saturday, 9 a.m. to 5 p.m. The service department works weekdays and every other Saturday.
The showroom sells hot tubs from Aquatic, Artesian, Harmonic, Island, South Sea and Garden Spas, plus TidalFit swim spas. Its supply side covers pool and spa chemicals, pumps and motors, salt systems, automatic vacuums, heaters and accessories. Its service crews do openings, closings, maintenance, vinyl liner replacement, safety cover cleaning and storage, and salt system conversions. Phone: (314) 821-6660.
https://www.prestigepoolsandspas.com/
7. Just Pools, Inc.
Best for: Jefferson County owners who need liners, leak detection or equipment repair.
Just Pools is a family-owned store in Arnold, at 3987 W. Outer Road South (63010), and says it has served the area for more than 40 years. It’s the closest stop on this list for Arnold, Imperial, Festus and the rest of Jefferson County.
Its service list is broad: liner replacements, safety covers, sand changes, openings and closings, inspections, sump pits, and repairs on filters, pumps, heaters and chemical systems. It also offers camera leak detection and pressure tests. It repairs equipment and pool cleaners in-house. On the supply side, Just Pools carries the Clear Result chemical line and Ocean Breeze salt products, and it sells Garden Leisure hot tubs, which are made in Athens, Tennessee. Its pool-care guide suggests free chlorine of 1.0 to 3.0 ppm and pH of 7.2 to 7.6, and it tells owners to bring a water sample to their local dealer. Phone: (636) 464-7110.
https://www.justpoolsandspas.com/
8. Spas and More
Best for: Shoppers comparing hot tubs, swim spas and saunas.
Spas and More has sold Master Spas hot tubs and swim spas in the area since 2002. Its St. Louis showroom is at 12957 Gravois Road in Sunset Hills (63127), open Monday through Saturday, 9 a.m. to 5 p.m. It also sells Sweaty GOAT saunas. The store stocks hot tub filters, chemicals and parts and has a service and repair department, so you can keep buying supplies and getting service from the store that sold you the tub. Phone: (314) 843-7727.
https://www.spasandmorestl.com/
9. Munie Leisure
Best for: Metro East owners who want a printed, detailed water test.
Munie Leisure is at 4200 N. Illinois Street in Swansea, Ill. (62226), close to Belleville, Fairview Heights and O’Fallon, Ill. Its free in-store computerized water test comes with a printout. It checks free and total chlorine, total alkalinity, cyanuric acid, calcium hardness, iron, pH, copper, total dissolved solids, salt and phosphates, and Munie recommends bringing in a sample at least once a month.
The store carries pumps, filters, heaters, cleaners, liners and covers. It sells Latham in-ground pools, Radiant on-ground pools, Trevi and Carvin above-ground pools, and Jacuzzi hot tubs, and its online store lets you buy online and pick up in the store. Hours are Monday through Friday, 9 a.m. to 5 p.m., and Saturday, 9 a.m. to 3 p.m. Phone: (618) 234-8004.
10. Oasis Pool Center
Best for: Riverbend-area owners shopping for supplies, hot tubs or an above-ground pool.
Oasis Pools is a St. Louis and Metro East pool builder owned by Chip Unnerstall and Nicole Newkirk, who say they’ve been involved in building about 1,000 pools. In April 2026 they opened their first retail store, Oasis Pool Center, at 1488 E. Edwardsville Road in Wood River, Ill. (62095). The Alton Telegraph covered the opening.
The store sells pool chemicals, pumps, filters, heaters, cleaners, lighting and above-ground liners, and it offers free pool and spa water testing. It is a certified Dynasty Spas dealer and sells Wilbar and Trevi above-ground pools. Its team lists PHTA, CPO and IPSSA certifications, and Oasis also offers cleaning, maintenance, repairs, openings and closings. Phone: (618) 655-9510.
How to choose a pool and spa supply store in St. Louis
Plan around the St. Louis pool season
St. Louis pools follow a short, busy calendar. R&S, for example, describes March through May as its opening season. Stores are crowded and service calendars fill up then, so book your opening early. Fall closings run the other way. Water has to be lowered, lines blown out and winterized, and equipment drained before hard freezes, because water left in pipes, pumps and filters can crack them. If you close your own pool, buy your winterizing chemicals, plugs and cover parts before the October rush, and ask your store which steps it would leave to a technician.
Hot tubs run year-round, so winter is when they’re most exposed. R&S’s advice if a heater fails during a cold snap: don’t drain the tub, and keep the cover on while you wait for a repair. That’s a good reason to pick a store with a service department that works in winter.
Use free water testing, and bring a good sample
Free water testing is the best deal in pool and spa supply St. Louis stores offer, and most stores on this list do it. Take your sample from about elbow depth, away from the return jets, in a clean bottle, and bring it in soon after. A good test covers free and total chlorine (or bromine), pH, total alkalinity, calcium hardness and cyanuric acid (stabilizer). Salt pools also need a salt reading, and phosphates and metals matter if you’re fighting algae or staining. Munie and Baker publish exactly what they test. Ask any store for a printout so you can track changes over the season.
How often? Baker suggests at least every two weeks and Munie at least monthly, plus a quick home test-strip check between visits.
Know your equipment before you shop
Take a photo of your pump, filter, heater and salt cell labels, including the brand, model and serial number, before you drive to the store. Better yet, bring the old part. Many repairs come down to a seal, an O-ring, a filter cartridge or a salt cell, and having the exact part number saves a second trip. Stores with a repair bench, like R&S, Four Seasons, Pool King and Just Pools, can tell you whether a pump or robotic cleaner is worth fixing before you buy a new one.
Chlorine, salt or something else?
Most St. Louis pools use chlorine, either added by hand or made from salt by a chlorine generator. Salt pools still need chlorine, pH and stabilizer testing, and the cell needs periodic cleaning. Four Seasons and Mirage both service salt cells. If you use a non-chlorine system such as Baquacil, stay with a store that stocks it, like Pool King, because Baquacil’s EPA-registered label says it isn’t compatible with chlorine or other chlorinating products, including salt chlorinators. Whatever you use, read and follow the label on every chemical. Store them cool, dry and sealed, keep acids and chlorine apart, and never mix products in the same bucket.
Buying a hot tub
Buy the store as much as the brand. The dealer that sells your tub usually handles warranty service, stocks your filters and covers, and comes out when a heater or control board fails. Before you buy, ask the dealer:
- Can I test soak the model I’m considering? (R&S and Baker both offer test soaks.)
- Who does warranty service: your own technicians or a subcontractor?
- What electrical service does this tub need? R&S notes that premium tubs typically need a dedicated 240-volt GFCI circuit, so budget for an electrician.
- Do you keep filters and covers for this model in stock?
Draining a pool or hot tub in St. Louis
Don’t just open the drain. MSD Project Clear asks homeowners to stop adding chlorine for several days so it can dissipate, and to drain only water that isn’t cloudy, discolored, full of algae or loaded with sediment. Drain on your own property toward a drainage channel, storm inlet or curb gutter at a controlled rate, without causing erosion or a nuisance for neighbors. See MSD’s pool and spa tips for the details, and check your municipality’s rules.
Red flags
- A store that sells you a cart full of chemicals without testing your water first.
- No printout or written results, so you can’t tell what changed between visits.
- Pushing a new pump or cleaner without checking whether the old one can be repaired.
- A hot tub dealer that can’t say who handles warranty service or where its technicians are based.
- Service plans or opening prices that aren’t in writing before the work starts.
Bottom line: For the pool and spa supply St. Louis owners need most, start with R&S Pool & Spa in Maryland Heights for parts, repairs, water testing and hot tubs under one roof. In St. Charles County, add Four Seasons Pool. In West County, try Baker Pool & Spa, and in South County, Pool King Recreation. Metro East owners have Munie Leisure and Oasis Pool Center close by.
Looking for more St. Louis guides? See our best HVAC contractors in St. Louis and best roofers in St. Louis lists, or browse our Industries Served page.
Frequently asked questions
What is the best pool and spa supply store in St. Louis?
R&S Pool & Spa in Maryland Heights is our top pick for 2026. It has a large parts warehouse, free computerized water testing, an in-house repair shop that also fixes equipment for other pool companies, Nordic and Marquis hot tubs, and published service-plan prices. Four Seasons Pool, Baker Pool & Spa and Pool King Recreation are strong choices in St. Charles County, West County and South County.
Where can I get pool water tested for free in St. Louis?
Most stores on this list test water for free. R&S Pool & Spa, Four Seasons Pool, Baker Pool & Spa, Pool King Recreation, Mirage Spa Service and Supply, Munie Leisure and Oasis Pool Center all offer free in-store water testing. Bring a clean sample taken from elbow depth, away from the return jets, and ask for a printout of the results.
When should I open and close my pool in St. Louis?
Most St. Louis openings happen in spring. R&S Pool & Spa describes March through May as its opening season, and service calendars fill up quickly then. Close the pool and winterize the lines and equipment before hard freezes set in. Water left in pipes, pumps and filters can freeze and crack them, so book your closing early in the fall.
How often should I test my pool water?
Use home test strips or a test kit between store visits, and get a full store test regularly. Baker Pool & Spa recommends testing at least once every two weeks, and Munie Leisure recommends bringing in a sample at least once a month. Test more often after heavy rain, a pool party or a heat wave.
What chemical levels should a hot tub have?
R&S Pool & Spa recommends keeping spa pH between 7.2 and 7.8, with bromine at 3 to 5 ppm or chlorine at 1 to 3 ppm. It also suggests draining and refilling a hot tub every three to four months. Follow the label on every chemical you add, and ask your store to test the water if readings look off.
How often should I replace my hot tub filter?
R&S Pool & Spa suggests rinsing a hot tub filter every two weeks, soaking it in filter cleaner every three months and replacing it every 12 to 18 months. Bring the old filter or its part number to the store so you get an exact match.
Can I drain my pool into the street in St. Louis?
MSD Project Clear asks homeowners to stop adding chlorine for several days before draining so it can dissipate, and not to drain water that is cloudy, discolored, full of algae or heavy with sediment. Drain on your own property toward a drainage channel, storm inlet or curb gutter at a controlled rate, without causing erosion or a nuisance. Check your municipality’s rules as well.
Should I repair or replace my pool pump?
It depends on the pump’s age, the part that failed and the cost of the repair. Many failures come down to a seal, bearing or motor that can be repaired. Stores with repair benches, such as R&S Pool & Spa, Four Seasons Pool (which lists a $100 pump bench fee), Pool King Recreation and Just Pools, can diagnose the pump before you buy a new one.