I am building in an aquarium in my basement, and part of that system is an automatic water exchanger. I have a hose connected to the 1/2" copper cold water pipes that runs to a whole-house filter and make the transition to PVC at that point for the rest of the system. Problem is that the hose fitting is hose x FPT, and as many times as I try to redo it, I can't get the darned threaded fitting to seal. I've wrapped teflon three times up to ten times, tightened firm to harder than I know I should, and no matter what I try I can't avoid a leak.

Anyone out there know the magic incantation that gets a seal to take?

Greg