I have been cleaning my balls once a month, but only half of them. I put a plexi glass divider between my chamber. Then once a month I take out half and rinse in old tank saltwater and put them back in. I have not had a ammonia spike yet. Nor have I gotten anything off of my balls either. So I don't know if this is a neccesity or not, but I will continue to do so just in case.