"Cooler filters" ? as in swamp coolers used in the dry southwest?
Most of them have some sort of stuff on them to retard mold and I would
check really good to be sure they aren't going to kill your fish. Good Luck
what ever you decide to use. Kathy in AZ

Yes, swamp coolers. I am in Northern Nevada and I forget that not everyone
uses a swamp cooler. hehe
Thanks for the advice, Kathy. I decided to go ahead and try the Dura Cool. I
will keep you informed as to what happens to the fish.
Shawn