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I don't do much splashing Chad
Bet you are in it once to twice a day, it being new.......if so, i would guess that a 1/2 inch over a week could just be lost getting out of the tub.
QuoteI don't do much splashing ChadBut you do *some* splashing?
Sounds like a lot to me, I only lost about 1" from August to November, two people using it 4-5 times a week.
If you want to really cut down on water loss just don't use it.