Sand Filter: In this method, impurities
are extracted from the water utilizing sand to collect and attract
the debris. 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. Sand filters trap debris as small as 20
to 40 microns.
DE (Diatomaceous Earth) Filter: Diatomaceous
earth is mined and is the fossilized exoskeletons of tiny diatoms.
They are used to coat "grids" in the filter housing and act as tiny
sieves allowing for the removal of debris as small as 5 microns.
Once the pressure rises, the filter is backwashed just like a sand
filter and then "recharged" with more DE powder. DE filters trap
debris as small as 2 - 5 microns.
Cartridge Filter: Cartridge filters have a greater surface
area than sand allowing for fewer clogs and easier maintenance.
Cartridge filters are designed to run at lower pressure than sand
which puts less backpressure on the pump, providing more flow and
turnover. Cartridge filters should be cleaned once or twice a season
by simply hosing them off. Cartridge element filters trap debris as
small as 10 to 15 microns.