I've looked through this forum and have an idea that I may have algae but was hoping to pick your all' brains just a bit. I have a brand new pool put up in Feburary. 18' above ground with a 1 hp Hayward sand filter. I was told normal operating pressure was 14-16 psi and I normally backwash at 20. As of the last 4/5 days I'm backwashing every day. The folks at the pool store say it's normal for a little while but if it persists to call them back. Anyone care to offer any perspective or opinions? I would appreciate it greatly!