Hot Tub Water Care
Plain-English, source-cited guides to keeping spa water clean and balanced.
Guides
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Hot tub water balance cheat sheet
Ideal levels for chlorine, bromine, pH, alkalinity, and hardness — and the order to adjust them.
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How much chlorine (or bromine) to add
The per-gallon dosing math, after-soak top-ups, and weekly shock, with a worked example.
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Why is my water cloudy, foamy, or green?
What each symptom means and the order to fix it — including why clear-green and cloudy-green need different cures.
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How to lower (or raise) pH and alkalinity
Which chemical moves which, why alkalinity comes first, and the dosing math with a worked example.
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New hot tub startup: fill and balance
A first-fill, step by step — fill, balance minerals, then sanitize, in the order that keeps water easy.
Soak: Hot Tub Assistant
Enter a test reading and your tub volume; Soak gives the exact dose for your products, in the right order, with plain-English guardrails. Pay once, no subscription, no ads, fully offline.