DIY: Hot Tub Service

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 If you've decided to manage your own spa water (see our professional vs. DIY comparison if you haven't yet), here's the actual routine that keeps water balanced without guesswork.

Test 2–3 times a week — more often during summer, when heat accelerates chemical demand and evaporation changes concentration faster than in cooler months. Each test should check pH, alkalinity, and sanitizer level at minimum. A liquid test kit is more accurate than test strips if you want to catch small drifts before they become visible problems.

1. Alkalinity first. If it's outside 100–150 ppm, adjust it before touching pH — alkalinity is what keeps pH stable, so fixing pH first just means it drifts again.
2. pH second. Target 7.4–7.6. Add a pH increaser if low, a reducer if high, and follow label dosing rather than eyeballing amounts.
3. Sanitizer third. Once pH is in range, your chlorine or bromine will actually work as intended — this is why sanitizer problems often resolve simply by fixing pH first.
4. Re-test after a few hours, not immediately — chemicals need time to fully dissolve and react before a test gives you an accurate read.

• Rinse filters weekly, deep-clean monthly with a filter cleaner that breaks down oils and lotion residue, not just surface debris
• Run the spa a full 15 minutes (roughly one filter cycle) each time it's used — this circulates water through the filter properly rather than leaving contaminants in low-flow areas
• Vent the cover 15–30 minutes daily on 100°F+ days to reduce chemical off-gassing buildup underneath
• Shower before getting in — this alone meaningfully cuts down on the oils, lotions, and cosmetic residue that drive up TDS and chemical demand

• Cloudy water that doesn't clear after your normal testing/adjustment routine → check TDS specifically, not just pH/alkalinity/sanitizer
• A strong odor that returns within a day or two of shocking → possible biofilm issue (see our biofilm guide)
• Foaming or visible scale on surfaces → usually alkalinity or calcium hardness out of range, not a sanitizer problem

Water reaches a saturation point where it can no longer absorb additional chemicals effectively, typically around the 4–6 month mark or sooner if TDS approaches 1500 ppm. Past that point, adding more chemical doesn't help — the water needs to be drained, the shell cleaned, and the spa refilled from scratch. We call this a Spa RepHresh, and it's the DIY equivalent of an oil change: routine, not emergency, if you stay ahead of it.

If you've been testing and adjusting consistently and you're still fighting recurring cloudiness or odor, the issue is often one of two things: TDS has quietly climbed past its useful range, or there's a biofilm problem hiding in the plumbing that water-only treatment won't reach. Both are fixable, but neither responds to "add more chemical" as a strategy.

If you want a second opinion on your water before committing to a full DIY routine, or you're stuck on a persistent issue, reach out — we're happy to help you troubleshoot even if you're not looking for ongoing service.