Diatomaceous Earth (DE) filters

DE filters are the most efficient (or rather were the most efficient before Zeolite became available), and dearest, type of filter and they will trap dirt particles down to 3-5 microns

Hayward DE Filter and Diagram

                 Hayward D.E. 2420 Pool Filter

However, a sand-filter containing Zeolite, or a standard sand-filter media, such as Silex or crushed glass, used in combination with Jolly Gel, will filter to the same standards as a DE filter

  • Diatomaceous Earth is a fine powder made from billions of fossilised plankton skeletons
  • DE powder is so fine that it is a skin irritant and great care must be taken not to breath the dust as it is considered (by some Health Authorities) to be a carcinogenic
  • The inside of a DE filter holds a number of fine grids coated with DE powder
  • It works exceptionally well to catch and hold dirt
  • Maintenance of DE filters can be demanding, though: - 
  • Most types require periodic back-washing and this is not always sufficient to get them thoroughly clean
  • You may need to remove the grids periodically, discard the used DE powder and thoroughly clean your DE filter
  • This can be problematic because some towns (in the USA, notably) classify spent DE powder as toxic waste, so it cannot be dumped

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