I soaked the cell in a 25% muriatic acid solution - per Aquarite. It looks to be perfectly clean. Anybody got a "life-span" on filter sand? Basically, I think my problem is that I can't get/keep FC in it. You would think running the pump 12 hrs a day at 75% on the Aquarite, I would see a change, but it slowly dissipates. I added another 50 lbs of salt again today. It was at 2700 before so I will see tomorrow how far it changes. Should my cya really be around 80? If so could that be my problem - it is 42 now.

Thanks for the replies,
Brad