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Filters get rid of dirt from your pool’s water, keeping it fresh and clean.
While they cannot filter algae, bacteria, or minerals from the water, filters
are still a fundamental part of the hydraulics system. All filters are
typically designed to remove oils, grease and dirt from pool water.
However, don’t wait until pool water loses clarity to check the filter. An
increase in the pressure registered by a gauge on the filter tank or a
reduction in water circulation is a sign that the filter needs to be cleaned.
NOTE: Dangerous pressures can build up inside a filter. Before
you attempt any maintenance operation, be sure to consult a
pool professional or the equipment operations manual.
There are three basic types of filters for your pool:
Sand filters are the most popular type because they are less expensive and
simpler to operate and maintain. Pool water is pumped through layers of sand
inside a pressurized container. Dirt and grease particles are retained in the
sand. When the filter becomes dirty, it begins to restrict the flow of water,
causing water pressure to increase. This indicates that the filter should be
cleaned – a relatively simple task of “backflushing” or reversing the water
flow to clear the dirt from the filter. With proper backwashing and use of a
filter cleaner, the sand can last indefinitely.
Diatomaceous Earth (D.E.)
These filters contain diatomaceous earth, a white powder that filters
out even very small particles. These types of filters offer less resistance to
water allowing the pump to work easily, even when the filter is dirty. D.E.
filters remove much more dirt from the water and offer outstanding cleaning
abilities. They are cleaned by backflushing just like the sand filter, and used
D.E. powder is discharged along with the water. Used powder must be replaced by
adding it to the skimmer. D.E. filters provide the cleanest water but require
more maintenance since the filter must be routinely taken apart for manual
cleaning.
Cartridge Filters
require no backflushing and also offer low water flow resistance.
Polyester elements within the filter trap dirt and are very durable. Higher
water pressure indicates the need to clean the filter just as on sand filters,
but the cleaning process is different. The filter is removed from the unit and
can be rinsed with a water hose to remove dirt. Oily buildup can be removed by
soaking the filter in detergent. Cartridge filters are relatively easy to clean
and also have a low replacement cost. They should be replaced when they fail to
maintain clear water in the pool or when they show signs of wear.
What filter is best?
For new pool construction, discuss options with your builder and select the
type that best fits your needs. For remodeling and expansion projects, any pool
professional will be happy to review the styles, sizes and respective benefits
to help you find the right filter for your pool.
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