Could You Help Me Open My Pool?

Unfortunately you are going to have to drain it to reseal and fix the problem from Bottom to top. If you dont then you will NEVER have a clean running pool. the filter is only for small microbial dibree not for black algea.Black algae is one of the most difficult varieties to control and eliminate. This algae can appear as a blackish discoloration or a tar-like deposit. In either case, it is a problem to remove because of the physical nature of this algae. It has, as its outermost surface, a layer of polymucosaccharide. This can act as a water repellent barrier and shield the underlying algae from contact with the chemically-treated water. In addition to shock treatment and application of a polymer algaecide, it is recommended that the pH be dropped to 7.2, the circulation be directed towards the affected areas and a "quat" algaecide be added. The addition of the "quat" algaecide will not kill black algae, but it can act as a wetting agent that will help the chemicals through the polymucosaccharide barrier.