I've been looking into getting the Python No spill Clean N' Fill my only concern is the chlorine. Normally I put the water in a 5 gallon bucket add instant declore too it and then add the water to the tank. My water is straight from lake Michigan so there isn't much chlorine in it, but still. How much of a difference would it make for the fish by putting the water straight into the tank and adding the declore to the tank?