Dependable Pool and Spa Services offers a variety of swimming pool filters best suited for your application and equipment, with sand replacement and filter service and repair.
The two most commonly used pool filters in the Pacific Northwest are cartridge filters and sand filters. Both will fulfill the filtration task nicely, but should be chosen according to the application. Each type of pool filter is sized according to the pool.
Cartridge Filters offer a higher filtration rate and are simpler to install. They do, however, need to be serviced much more frequently and they also need frequent replacement of expensive cartridges. Cartridge filters do not have a valve for diverting water flow when needed for cleaning, draining, bypassing, or closing the filter. Cartridge filters are not the best solution for outdoor, uncovered pools that tend to receive a lot of tree debris.
Sand filters are the easiest to operate and maintain. The sand will normally last two to five years and a simple, routine backwash operation will refresh the sand between changes. Sand filters are equipped with a multi-port valve that allows pool water flow to be controlled for filtering, back washing, draining, bypassing, and closing.
In pool locations with tree debris, sand filters require much less maintenance. Sand filters are initially costlier to install and, although adequate, do have a lower filtration rate.
Pictured is a Hayward sand filter equipped with a multi-port valve https://www.hayward-pool.com/shop/en/pools/filters-info . The tank contains a special sand that captures unwanted material as water is pumped through the filter. When the gauge indicates the filter is becoming clogged with debris, simply switch off the pump and turn the black valve handle (at the top) to select back wash. Switch the pump back on and the debris is washed away, refreshing the sand. There is a glass vial under the gauge, and when the water in the glass runs clear, you know your sand is cleaned!
Pictured below is a Hayward cartridge filter system. Pumps are turned off and the canister is opened, exposing the old filters, which are replaced periodically. The replacement filters are a continual expense, so these filters are better suited for indoor, covered pool applications.