How to Clean a D.E. Filter

If you have a DE (diatomaceous earth) filter, you have the best filtration available for a residential pool, but there is a bit of a catch . . . the DE filter is the most complicated to maintain. In this section, we describe the process of cleaning the filter, step-by-step.If this all seems complicated (and it is) then no need to worry. You can always just call the professionals at Pool Stop and we will come out and perform this necessary service every six months for you.

How to clean a D.E. filter.

1. Backwash the filter to remove as much DE as possible.
2. Turn the pump off at the master switch (so it does not accidently turn on by itself). Make sure the pressure gauge returns to zero pressure.
3. Put the backwash valve back in filter mode.
4. Open the air relief valve to allow the water to drain from the filter.
5. Loosen and remove the center band (or clamps) that hold the filter together. Remove the top half of the filter.
6. Remove the grid assembly – most of the time it is easiest to just take off the top manifold and remove the grids one by one because the grid assembly gets really heavy and unwieldy after it is full of DE and dirt.
7. Lay out the pieces and clean them with a strong spray of water. Inspect all of the grids for broken frames or torn fabric. Check for any signs of wear. Inspect the manifold for cracks or “cave-ins”.
8. Replace any bad parts and put the grid assembly back together. Clean any residue out of the bottom of the tank.
9. Before putting the o-ring back on the filter, put a light coat of Magic Lube Red silicone lubricant on the o-ring.
10. Put the grid assembly back in the filter and put other pieces in place.
11. Put the top half of the filter tank back in place and make sure that the pressure gauge is positioned where you can see it while turning the pump on.
12. Put the band (or clamps) around the center of the filter and tighten until it is finger tight. Then use a socket to tighten it further. While tightening the band, use a mallet to tap lightly on the clamp around the tank so that it gets tight without having to put excess torque on the clamp nut.
13. Start up the pump and check for leaks. If the filter pressure shoots up above 30 psi, then turn the pump off and check for the source of blockage.