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It is recommended that DE filters be dismantled and inspected at least once per year— ideally, every 6 months to prevent DE powder "blow-back." Blow-back occurs when a filter is back washed, DE is then added, and most, or all of the DE, ends up in the pool rather than coating the grids and staying in the filter. This can be caused by a number of reasons:
Be sure the pool pump won't come on. Shut timer off, or "service mode" in automated systems. Service mode isn't usually accessible from the remote. Will need to execute service mode from the outside control panel.
There's no need for using any harsh chemicals to clean the filter grids. Just rinse the grids with a good jet nozzle on the hose. Do NOT take the grid assembly apart unless you like puzzles. Can be a bit of a hassle to re-assemble. When the grid assembly is clean it will need inspected. Look for cracks on the Manifold (top large plastic piece that holds the grid assembly together) Also be sure to inspect the grids themselves and look for rips or tears in the material.
There is an inner metal ring on the inside perimeter of the lower half of the filter, the split point. The rubber o-ring is wrapped around this metal ring. Remove both from the filter and rinse clean both the metal ring and o-ring. Rinse the split point on the filter housing of any loose debris.
Make sure that the o-ring is lubricated with a sealant/lubricant specifically designed and manufactured for swimming pool equipment. Set the lid on and turn lid slightly right and left to set the lid well into the lubricated o-ring. Replace the band clamp and tighten both bolts on each side of the filter housing. Replace the drain plug on the back of the filter. Close air relief valve.
© 2018 Rob Hampton
Rob Hampton (author) from Port Richey, Florida on January 14, 2019:
The o-ring can be found here..
Also, if you can't lift the grid assembly out, you should still be able to clean the grids but won't be able to inspect them for damage. Move grid assembly back and forth while pulling upwards and should be able to remove it.
[email protected] on January 13, 2019:
The grid will not lift out. Afraid to put too much vertical pull on it so as to not break the pipe. Second, after cleaning everything and putting the O-ring and top back on, it leaks water at 20+ PSI. Used Silicon Plumbers lube on all sides of the O-ring, and tightened the band to specs. Now seeking NEW O-ring and find that Purex Triton Nautilus FNS 36 parts do not exist under this name. suggestions?