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Water chemistry

The handful of numbers a hot tub runs on, what each one does, and the order to fix them in.

test strip and reagent drop test kit compared side by side over spa waterWater chemistryHot tub test kit reads "fine" but the water is not: strips vs drop kits explainedhand holding a chlorine test strip over hot tub water showing an overly high readingWater chemistryHot tub chlorine too high: how to bring it down safely before you soaka hand holding a pH test strip above rippling hot tub water for a readingWater chemistryHot tub pH keeps climbing: why it drifts high and how to bring it back downcoarse white bath salt crystals spilled beside a steaming residential hot tubWater chemistryCan you put Epsom salt in a hot tub? What magnesium sulfate actually does to your water and equipmenthand holding a wet test strip above hot tub water to read alkalinityWater chemistryHow to lower or raise total alkalinity in a hot tub and stop the pH bouncea wet test strip with two distinct chlorine reading pads held above spa waterWater chemistryFree chlorine vs. total chlorine: which number on the test strip actually mattersfive plain hot tub chemical containers and a test strip caddy on a deck shelfWater chemistryHot tub chemicals you actually need (and the ones you can skip)Hands checking a water test vial beside a steaming hot tub ledge at duskWater chemistryHot tub water chemistry in plain words: the five numbers and which to fix firstgloved hand pouring granular shock treatment into an open, jet-running hot tubWater chemistryShocking a hot tub the right way: when to do it, how much to use, and which kind