Swimming Pool Filter Cleaning

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Sand or D.E. Filter Backwash, Cartridge Cleaning

Backwash & Cleaning of Filters


The three Pool Filter types discussed are Sand, Cartridge, and Diatomaceous Earth (D.E).




Sand filters must be backwashed (running it in reverse) to unload the water waste. This is a manual process that must be performed every few weeks.


D.E. Filter Backwash (Diatomaceous Earth)


Diatomaceous earth covers the "grids" in the filter housing and act as tiny sieves allowing for the removal of debris. Once the pressure rises by more than 5 PSI, the filter is backwashed just like a sand filter and then "recharged" with more DE powder.




Cartridge filters should be cleaned once  the pressure rises by more than 5 PSI or twice a season by simply hosing them off.

Importance of regular filter cleaning


  • Ensures the maximum flow of water through the Filter
  • With higher pool circulation, less pump "ON" time is needed
  • Less pressure inside filter - longer life for Diatomaceous Earth (D.E.) filters


 In the case of D.E. Although regular backwash is encouraged, annual filter cleaning cleans the filter completely, in areas where backwash did not reach.

Maximum flow rate

With less pressure in the system, less stress on the pump and motor will yield a longer working life.


Higher water circulation

The pool water gets circulated quicker, shorter "ON" cycles for the pump is needed. This saves on your electric bill, and lengthens the motor's service life.


Lower filter pressure

A high pressure in the D.E. filters can cause the grids inside the grid assemblies to break (collapse) prematurely, since the plastic grids tend to become brittle over time.

Updated: 26 Aug 2020

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