DE pool filter losing pressure

[PoolDoc]

Unfortunately I inherited the pool when I bought the house and don't have a manual.

Try to find one on the Internet . . . and save it. You'll likely need it eventually, and it may become harder to find as time goes on.

[vinper]

test it by running it with out a few grids , that will tell you if they are plugged , if so your pressure in the tank would be extremly high , Im assuming you dont have a gauge on it.

[vinper]

fyi ,clean out all de , before test