Hot tub maintenance comes down to a short, repeating routine: test and adjust the water before you soak, shock and rinse the filter every week, deep clean the filter every month, drain and refill every two to four months, and replace worn filters once a year. Below: the schedule, water chemistry numbers from CDC and the American Spas 2026 owner’s manual, what an ozonator does not replace, and safety limits.
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Hot tub maintenance schedule at a glance
Two makers whose tubs we carry publish similar schedules: American Spas and the Canadian Spa Company Toronto SE manual.
| When | American Spas manual | Canadian Spa Company manual |
|---|---|---|
| Before each soak | Test with strips or a reagent kit and adjust chemicals | Replenish sanitizer |
| Weekly | Test and adjust; spray off the filter; one ounce of oxidizer shock; stain and scale preventer if your water is high in calcium | Balance water to test strip readings, shock, add scale control |
| Monthly | Deep clean the filter | Not listed |
| Every 2 to 4 months (3 to 4 for Canadian Spa) | Drain and refill; clean the acrylic; clean and treat the cover and pillows; deep clean the filter | Add spa flush, then drain and refill; replace the filter per its schedule |
| Yearly | Replace filter cartridges if the pleats look frayed | Check the UV-C bulb, if fitted |
Your own manual wins over any general schedule; warranties can depend on it.
Every soak and every week: testing and sanitizer
CDC’s home pool and hot tub guidance recommends a pH of 7.0 to 7.8 and free chlorine of at least 3 ppm in hot tubs, and says to test chlorine and pH at least twice a day, more often when several people use the tub. CDC advises against cyanuric acid stabilizer, including dichlor and trichlor, in hot tubs.
American Spas gives these ideal ranges for its spas:
| Test | Ideal range (American Spas) |
|---|---|
| pH | 7.2 to 7.6 |
| Total alkalinity | 80 to 120 ppm |
| Calcium hardness | 150 to 200 ppm |
| Chlorine, without ozonator | 3.0 to 5.0 ppm |
| Chlorine, with ozonator | 2.0 to 4.0 ppm |
| Bromine, without ozonator | 6.7 to 11.0 ppm |
| Bromine, with ozonator | 5.7 to 10.0 ppm |
Note that the manual’s low end for chlorine with an ozonator (2.0 ppm) sits below CDC’s 3 ppm minimum. Holding chlorine at 3 to 4 ppm satisfies both.
Hot tub chemicals for beginners
- Sanitizer: chlorine or bromine. American Spas specifies granulated chlorine, not liquid, and says never to use trichlor, which it warns will damage the spa and void the warranty. For bromine it says to start fresh water with 2 ounces of granulated sodium bromide.
- Oxidizer shock: American Spas calls for a non-chlorine oxidizer shock, about one ounce weekly, after heavy use, or if the water smells strong. Run all jets on high with the cover open for 30 minutes afterward. It warns that chlorinating shock damages jets and pump seals.
- Balancers: pH increaser and decreaser, alkalinity increaser and decreaser, and calcium hardness increaser.
- Test kit: CDC says a DPD kit is more accurate than strips, and that very high chlorine (over 10 ppm) can bleach out a test and read falsely low.
How often to change a hot tub filter
American Spas recommends spraying the filter off weekly, deep cleaning it once a month, and replacing it once a year or as needed. Its deep clean method:
- Unscrew and lift out the filter.
- Soak it for at least 24 hours in a bucket of water with 8 oz of liquid filter cleaner.
- Spray each pleat with a hose.
- Reinstall it without overtightening.
The manual suggests keeping a spare filter so you can soak one while using the other, and stresses never running the spa without a filter, since debris can be pulled into the plumbing. It names a dirty filter as the most common cause of a spa that will not heat. Canadian Spa Company lists filter replacement in its every 3 to 4 months column and says its tubs require genuine Canadian Spa Co. filters for warranty coverage.
How often to drain a hot tub
American Spas says to change the water every two to four months depending on use; Canadian Spa Company says every 3 to 4 months, adding a spa flush product before draining. Heavy use points to the short end. On refill day, clean and polish the acrylic, clean and treat the cover and pillows, deep clean the filter, and rebalance from scratch.
Going away? American Spas says a spa can sit up to two weeks if you set vacation mode (or lower the temperature to 80 F), adjust pH and shock before leaving, then check pH and shock again when you return. For longer absences without a service, it strongly recommends draining or winterizing.
Hot tub ozonator: what it does and does not replace
An ozonator injects ozone into the water as it circulates. The American Spas manual is clear on the limit: “You will still need to test for chlorine or bromine and occasionally replenish it.” What it does change is the target. The manual’s sanitizer ranges are about 1 ppm lower with an ozonator than without. On spas with a circulation pump, the ozonator runs with that pump; otherwise it runs during filter cycles.
Treat it as a helper: you still test, sanitize, shock, clean filters and drain on schedule.
Several American Spas models we list include a HydroClear ozonator and a 50 sq ft Bio-Clean filter, per their listings, such as the American Spas 6-Person 40-Jet Lounger with Ozonator (listed at $7,300 at the time of writing), the 6-Person 45-Jet Lounger with Ozonator ($7,700) and the Dual Voltage 6-Person 18-Jet Plug and Play ($7,100). The Canadian Spa Toronto SE ($12,749) lists an ozone generator with antimicrobial Glacier filters. Browse the full American Spas range.
Cover care and the gear that makes it easier
American Spas says to clean and treat the cover and pillows at each water change, using a protectant made for spa covers. It warns against automotive vinyl protectants. Canadian Spa Company says not to sit on the cover and to clear water and debris off it. When a cover sags, cracks or gets waterlogged, our hot tub cover replacement guide covers measuring and foam.
Opening the cover daily for testing is easier with a lifter. The Top Mount Cover Lifter ($299.99) needs 10 in of clearance behind the spa per its listing, and the Roller Cover Lifter ($105) lists 42 to 48 in. A step such as the American Spas 2 Tier Step 60″ ($650) helps with filter pulls.
Temperature and health safety
The U.S. Consumer Product Safety Commission says hot tub water should never exceed 104 F, and calls 100 F safe for a healthy adult. Both manuals give the same 104 F ceiling. CPSC and Canadian Spa Company advise pregnant women to stay at or below 100 F, and to check water with an accurate thermometer. Both manuals say people with heart disease, blood pressure or circulation problems, diabetes, or who take medication should consult a physician first, and that alcohol raises the risk of overheating and drowning. If you are pregnant or have a health condition, check with your doctor before soaking.
Frequently asked questions
What is the minimum hot tub maintenance schedule?
Per American Spas: test before each use, shock and rinse the filter weekly, deep clean it monthly, drain every two to four months, replace filters yearly or when worn.
Does a hot tub ozonator mean I do not need chlorine?
No. American Spas says you still need to test and replenish chlorine or bromine; the ozonator only lowers the target range slightly.
How often should I change a hot tub filter?
American Spas says replace it once a year or as needed, with a monthly deep clean and weekly rinse. Canadian Spa Company lists replacement every 3 to 4 months.
What chlorine level is safe in a hot tub?
CDC recommends at least 3 ppm free chlorine and pH 7.0 to 7.8. American Spas lists 3.0 to 5.0 ppm without an ozonator.
Need help choosing a low maintenance tub?
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