Ok I have a pool with a sand filter. There is a clear plastic section on one of the pvc lines going to the pump/filter. It says Jandy Energy Filter on top of it and has a pressure gauge on top. Never seen one of these before. Today I backwashed the sand filter then cleaned/vacuumed the pool. The pressure on the jandy energy filter is about 30 psi. The filter inside the clear part is dirty. Any ideas on how to clean this filter? And how often I should clean it? Its about the size of small football. Sorry, best reference I could think of.