evaporation

Hello everyone! Wondering about what is the most efficient way to keep the water heated. If maybe keeping the ac on, helping the heater to maintain water temperature, i would get less energy consumption and less evaporation, since there is less difference between inside and outside water...

When the tank water goes down, but the water stays, the salinity increases. I read that the way to counteract that is to add dechlorinated fresh water, and I was wondering how you do that. Do you just fill the tank back to it’s original level? Also, would adding freshwater have any negative...

I was wondering seeing salt cant evaporate wouldn't that cause the salinity level to increase as the water evaporates?