to make it cooler you need to keep the water going up there as cool as possible
runthe water line thru the roof not over it
also if you make yourself a "water cooler" you can reduce the temps even more
if you took the pump and ran a line that goes from the pump to the top of the swamp cooler, run a 1/4 inch copper line down into the house with a coil of tube ran into your refrigerator, then running it from there back to the top of the swamp cooler
takes alot of tube but will really reduce the temp of the water
