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New hot tub owner here, bought the house two months ago and started with the TFP method almost right away. Tub is in a sun room detached from the house, covered, so the only sunlight that hits the water is if I open the cover during the day, and no leaves are falling in though the occasional...

I read in a previous thread that one can change the units used in PoolMath. I entered my hot tub's volume as 410 gallons based on the owner's manual, but would rather do measurements of additions with metric units - in part because measuring dry chemicals in grams and wet chemicals in mL is...

We just moved into a new house with a hot tub in a detached sunroom, and have been following the instructions left by the previous owner until I could learn enough about maintenance to adjust that schedule (his advice was to refill every year and add 1/2 tbsp of the dry chlorine he had once a...