DE Filter cleaning

At least once a year, or when pressure is 4 to 6 pounds higher than normal pressure after backwashing, the filter grid should be removed and cleaned. Backwash the filter before doing the following:
1.Turn pump off and open air relief valve. IMPORTANT: Be sure that all pressure is relieved from the filter tank before removing the clamp assembly.
2.Loosen each clamp nut alternately until the clamp can be removed. Remove the tank top.
3.Lift the entire grid assembly straight up off the upper piping assembly. NOTE: Do NOT keep grid assembly in the sunlight more than two hours, as this will shorten the life of the grid cloth.
4.Hose the grid elements thoroughly. Grid can be cleaned as a whole unit with a high pressure hose or placed in a large plastic container filled with warm detergent solution. Scrub grid cloth with soft brush. In cases where calcium deposits are evident, soak the assembly in 4 part water to 1 part solution of muriatic acid for 20 to 30 minutes. Rinse clean and proceed with detergent scrubbing.
5.Inspect the grid cloth for tears and check both the small upper pipe "O" ring and large tank seals for any nicks. Lubricate with water repellent lubricant and clean "O" ring and tank seal seat areas. Any damaged components should be replaced.
6.Replace the grid assembly by setting the manifold opening directly over the connector pipe. Push down on the grid assembly to check to see that it is seated properly.
7.Position the tank seal and place tank top on the filter. The tank top should rest on the seal evenly.
8.Clean the inside of the tank clamp and replace. Tighten nuts on both sides alternately and evenly.