I am a new spa owner and I am adding about an inch of water every week to my tub. I live in Indiana and it's between 80-90 degrees in the heat of the day. I have removed all the covers and can't find any sign of a leak. The tub is a full foam tub and there is no wet or soft foam anywhere. There is also no water on the ground under the tub. We use the tub 8-10 times per week with 3 people on average in the tub. This may be normal but it's driving me crazy since I can't find any leaks. Any help or info would be greatly appreciated!!