My son let his pool get away from him prior to me taking over the "pool duties". He had it well on it's way to clean before I got involved.

We are dealing with the last remnants of the dead algae. I asked him to pick up some floc today and, the lady at the pool shop told him not to use floc in a system with a cartridge filter. I have been impressed with the performance of this filter thus far. It has done a great job and done it quickly.

My only prior experience has been with a sand filter, so... Am I not supposed to use floc in a cartridge filter?