Guess I was rinsing mine to much. I have two 75 gallon tanks. One has Rena XP2, and a AC 70, the other has a AC 110, and a AC 70. I have been rotating rinsing one filter on each tank each week, then following week I will rinse the other.
I think I am going to go 1 time a month for each filter, and see how that works.
Thanks for the help.