— Equipment
Cartridge, DE and sand pool filters: what cleaning means for each
Residential pools around Deltona run one of three filter types. They catch dirt differently, so cleaning them is not the same job.
| Filter type | How it catches dirt | What a clean involves | How you know it is due |
|---|---|---|---|
| Cartridge | Pleated polyester element inside a tank, no backwash valve | Tank opened, element rinsed pleat by pleat, degreasing soak when oily, o-ring checked, reassembled | Pressure 8-10 psi over the clean reading, or weak flow at the returns |
| DE (diatomaceous earth) | Fabric grids coated with a fine powder that traps the smallest particles | Backwash, then a teardown: grids pulled and rinsed, checked for tears, reassembled and recharged with fresh DE | Pressure rise, DE blowing back into the pool, short runs between backwashes |
| Sand | A bed of graded sand inside a tank with a multiport valve | Backwash and rinse until the sight glass runs clear; the sand bed inspected for channelling | Pressure rise, water that never quite clears, backwashes that help for a day or two |
Cartridge filters are the most common on pools built here in the last twenty years and the easiest to neglect, because nothing reminds anyone to clean them. DE filters polish water better than anything else but need the most hands-on care, and the spent powder has to be captured rather than hosed down the street drain. Sand filters are the simplest to live with and the slowest to show a problem.