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For those of you that have D.E, Diatomaceous Earth filters. The D.E. filter is the most
efficient type of pool filter on the market. It can trap particles down to 3 - 5 microns; well
below what the naked eye can see. The pressure gauge indicates a need for backwashing
when it reads 8 - 10 lbs. higher than its clean reading. After backwashing a D.E. filter, a new
application of D.E. filter powder is added to the filter by pouring into the skimmer. An
annual breakdown of the filter is necessary to thoroughly clean D.E. filter grids. The annual
breakdown is not the same as backwashing which is usually done monthly. It is when the
filter band holding the 2 sections on the filter together is removed and the grids are taken
out along with the manifold. The grids are removed from the manifold one at a time and
chemicaly cleaned. Every grid is inspected for tears or holes which can lead to D.E leaking
back into your pool and causing cloudy water or white sandy settlement on the bottom.
The entire filter housings both halfs are cleaned as well as the contact points and pressure
gauge assembly. The bottom of the filter is rinsed and the tank o-ring and standpipe oring
are inspected and replaced if needed. The filter grids are then reassembled into the
manifold and the filter is put back together. D.E is then added after a full band leak check.
The manufacture suggests this be done once a year to save the grids after all new grids can
get expensive. By doing this your making sure you have the best water flow and less back
pressure on your pump so the motor does not have to work as hard. There are many
reasons for doing this, saving energy, prolonging grid life, keeping your pool as clear as
possible and not having to swim in water that has to filter thru the waste on the grids
below.