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Rob is a licensed pool service industry professional with over 20 years of experience.

Maintenance of DE filters

It is recommended to dismantle and check the DE filters at least once a year - ideally every 6 months to prevent the DE powder from 'blowing back'. Blowback occurs when a filter is backwashed, DE is then added and most or all of the DE goes into the basin rather than coating the grids and staying in the filter. This can have different causes:

  • Construction: Too much DE can build up over time and the backwash will no longer push the old DE away from the filter grids when the flow is reversed during the backwash cycle.
  • Torn Grids: If a filter mesh is cracked, DE powder will escape through the crack. Very small cracks still allow the filter to hold DE. Usually when a small crack occurs in one grille, it is usually not long after that other grids begin to crack as well. Although individual grids can be purchased, it is recommended that the entire set be replaced.
  • Distribution: The manifold on top of the grid assembly directs current through the grids. These can crack and blow most, if not all, of the powder back into the pool. In this case, the distributor must be replaced.

Dismantling the filter

Make sure the pool pump does not start. Shut timer off or 'service mode' in automated systems. Maintenance mode cannot normally be accessed from the remote control. Must run the service mode via the external control panel.

Remove the drain plug

Remove the 2 screws on the side

Remove the lid

Rinse out the tank

Clean the grid assembly

It is not necessary to use harsh chemicals to clean the filter grids. Simply rinse the grids off with a good nozzle on the hose. Don't take the grille apart unless you like puzzles. Can be a bit of a chore to put back together. If the grid assembly is clean, it needs to be checked. Look for cracks on the manifold (top large plastic piece that holds the grid assembly together). Also, check the grids themselves and look for any cracks or tears in the material.

Clean the grilles

Re-assemble the filters

On the inner circumference of the lower half of the filter is an inner metal ring called the Split point. The rubber O-ring is wrapped around this metal ring. Remove both from the filter and rinse both the metal ring and the O-ring. Rinse loose dirt from the split point on the filter housing.

O-ring and inner metal ring

Replace the grid assembly

Before replacing the lid

Make sure the O-ring is lubricated with a sealant / lubricant specifically designed and manufactured for pool equipment. Put the cover on and turn the cover slightly to the right and left to insert the cover properly into the lubricated O-ring. Replace the band clamp and tighten both screws on each side of the filter housing. Replace the drain plug on the back of the filter. Close the air release valve.

Clean filter pressure