Which filter is the best? You will need to answer these questions first
- How fine a particle do you want to filter?
- Where will it be used and what is your budget?
- 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. |
