How do you maintain a DE filter?

You can maintain a D. E. filter with an annual or twice yearly breakdown cleaning and inspection. Replace worn or damaged grids and tank gasket, lube the back wash valve, recharge with correct amount of D. E. If you have a back wash valve that sits under the tank then you should consider a pool service tech with knowledge of that specific filter. Because you need a couple of the correct tools to facilitate removal of the tank lid and the rotor valve assemble. This type of filter is known by several names.. . .Purex, C.H.D., Pentair to name a few of which there may be more than one model.

Ken