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Pool filters
Sand is sometimes called the “bullet proof” pool filters. In operation, a sand filter pulls water through a bed of sand and then removes it through lateral tubes at the bottom of the filter. Dirty water goes through the top one-inch layer of sand, the sand filters the water, and clean water exits the bottom. To clean a sand filter, run it in reverse and throw out the waste water. This usually has to be done every few weeks.
In pool filters known as a cartridge type, water flows through a filter material and the material captures debris. Cartridge filters don’t clog up as much as sand so they don’t have to be changed as often. Cartridges run at a lower pressure than sand. This places less back-pressure on the pump and therefore one get’s more flow and turnover. Normally these types of filters have to be cleaned only once or twice a season by hosing them off.
A Diatomaceous earth pool filter (DE) is filled with tiny exoskeletons of very small diatoms. They perform as coat “grids” in the housing of the filter and act as tiny sieves to catch debris. Once the filter begins to fill with waste particles the filter is backwashed and then recharged with more DE powder. DE filters maintain higher pressures than cartridges and can lead to a degree of inefficiency and flow reduction.
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