Understanding Swimming Pool Sand Filters, Swimming Pool Filter Sand, & Your Pool Filter System.
The pool filter system is a very important part of your swimming pool and choosing the right one takes time and effort. Sand filters have consistently proven their quality, reliability, and are very durable even in the harshest of climates. The pool sand filter is a high-quality that captures both small and large particles and debris which include algae spores, bacteria, leaves, hair, and insects.
Water is pushed through the sand in the housing and is removed by a set of lateral tubes on the bottom. The dirty water goes into the top of the filter, is pressed through the sand and exists out the bottom as clean water.
Ever had an "espresso" from a coffee place? Pool sand water filters work on the same concept. Let's dig a bit deeper into your sand filter.
As swimming pool sand filters becomes clogged with waste and debris, the pressure increases and the water flow decreases. Your filter should have a PSI/pressure gauge that will tell you the pressure. This requires the pool owner or operator to backwash every few weeks or when needed, depending on the water flow.
Please remember that excessive backwashing may cause a loss of sand which in turn will reduce the effectiveness of the sand filtration process. The measurement from the top of the sand to the top of the filter is called the "freeboard". Check your owner's manual for the correct measurement.
The freeboard, in my opinion, is one of the most important yet THE most overlooked aspect of sand filter maintenance. Please be aware of proper pool sand filter maintenance. Should you find your sand filter low, simply get the proper grade of sand and top off the filter following the manufacturer’s instructions.
In terms of cost and efficiency for swimming pool filter systems, a sand filter is probably the least expensive but least effective at removing those very small particles. You also want to gauge your pump motor to fit your filter. Too many people believe that "bigger is better" and that's true in some cases but not for sizing filter motors. 1/2 to 1 HP pump motors are generally more than adequate for a most home pools.
Swimming pool sand filters will always have what is called a Multi-Port Valve, or MPV. Each MPV will have at least 6 port settings with different applications and functions.
Filter: This setting filters the water and is what your sand filter will be set on 99% of the time.
Waste: This setting allows the water to run directly out of the filter and bypasses the sand. Waste can be used when your pool is very dirty and needs to be vacuumed. Word of caution: Waste setting will drain your pool so if you're going to be vacuuming your pool on this setting, make sure you keep the pool topped off with water. Don't allow the water level to dip below the skimmer.
Backwash: This is the cleaning cycle for your filter. It removes the trapped dirt and debris from the sand and improves filtration. You want to backwash when your filter psi (pounds per square inch) gets 8 - 10 psi over the "just-backwashed" psi.
Rinse: This setting is used after backwashing. Sometimes dirt and loose sand can remain in the lines after backwashing. The Rinse setting clears the lines of the debris. Think of it like rinsing your mouth out after brushing your teeth.
Circulation or Recirculate: This settings means the water bypasses the filter and is returned back to the pool without being filtered. Excellent for when you add chemicals and need to get them quickly mixed and circulated through the pool.
Closed: All filter ports are closed. This setting is generally reserved when servicing the pump motor or filter.
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