DE filters and sand filters are used to help keep swimming pool water clear of debris. DE stands for diatomaceous earth.
DE filters are generally larger than sand filters because DE filters can filter a maximum of two gallons per minute for every square foot of surface area of the filter, while sand can filter up to 15 gallons per minute for every square foot of surface area of the filter.
DE filters can catch particles as small as five microns, while sand filters can only catch particles that are at least 40 microns.
Sand and DE filters use internal backwash lines, but sand filters need to be backwashed about once a week, while DE filters only need to be backwashed every month or two.
A new sand filter will usually cost $50 to $100 as of October 2009, while a new DE filter will only cost $2 to $4. But the grids for DE filters can cost up to $300 to replace.
Sand filters usually need to be replaced every six to seven years when used for home pools, while DE filters must be replaced every backwash.
- Photo Credit Image by Flickr.com, courtesy of Lin Kristensen
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