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Filter Comparison

Which filter is the best? You will need to answer these questions first

  1. How fine a particle do you want to filter?
  2. Where will it be used and what is your budget?
  3. How much time do you want to spend on maintenance?

Here is some information to help you compare and contrast the sand and cartridge filters.

SAND CARTRIDGE
Size of particles filtered 20-40 microns 10-25 microns
Estimated filter rate 15-25 gallons per minute per square foot 0.375-1 gallons per minute per square foot
Relative cost of filter $$ $
Relative cost of media $ $$
Cleaning frequency Whenever the pressure reaches 10psi or higher than starting pressure.
Usally depends on bather load, hydraulics and filter design.
Whenever the pressure reaches 10psi or higher than starting pressure.
Usally depends on bather load, hydraulics and filter design.
Replacement frequency Typically, after 3-5 years the sand grains have worn smooth and need to
be replaced. This is indicated when the pressure fails to fall below 5 psi of initial pressure.
Typically, after 3-7 years.
Strongest selling point Requires little attention. NO backwashing provides easy maintenance.
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