<a href=showthread.php?s=&postid=7381043#post7381043 target=_blank>Originally posted</a> by DrBDC
I toss mine in a salt bucket that has 1 gallon muriatic acid from a pool supply and then filled the rest of the way with water. Add the acid to the water btw. Let it run for about 1/2 hour then have another bucket with just water and put it in there to run about 1/2 hour too. Works great. Same thing I do for all my powerheads. Watch the fumes. You can even do a 50/50 mix. Some do straight muriatic acid but I don't.