Water chemistry

Water-care guides

Four hot-tub chemistry guides: why pH rises, how to lower alkalinity, hard-water fill day, and foam. Then Water Match for your ZIP.

Why hot tub pH keeps rising
Jets strip CO₂ and carbonate alkalinity pushes pH up. How low-TA setup and a real borate buffer change the ritual — water chemistry only.
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How to lower alkalinity in a hot tub
High fill-water TA drives pH climb. Staged dry-acid steps, strip-confirm, and when to stop — no soak until pH is safe.
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Start-up chemicals for hard-water hot tubs
Hard fill (high calcium / high TA) needs a different fill day than soft water. ALK− first, then borate buffer — matched counts, not a one-size bottle.
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What to do about hot tub foam
Foam usually means soft water, oils/lotions, or both. Calcium where needed, enzyme/oxidizer for organics, and when defoamer is only a bandage.
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