My pool seems to be leaking. I still seem to think it is evaporation because it's down about 3 inches in my pool AND in my spa, which is a seperate body of water. I fill it up to the line and about 2 days later it's back down to the bottom of my tiles. I can't seem to find a leak and I just read about the bucket method to see about evaporation so I'll try that. If it's not evaporation, what could it be since I shut off the pump and just let it sit and the spa is down the same amount as the pool?