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Home-pool filters
High
Rate Sand Filters
The method of
filtration that has been in existence the longest is the sand
filter. It is also the most popular type of filtration.
The high rate sand filters are usually .45 to .55 mm. The sand that
is used with the filter is known as pool grade #20 silica sand. The
sand filter separates the particles while allowing filtration to
take place. This type of sand filtration is known as "depth"
filtration because dirt is forced
through the sand bed, then trapped in small spaces between particles
of sand. At first, the clean sand filter will eliminate large
particles, but as the sand bed collects more dirt, it will eliminate
the smaller particles as well.
When sand filters are in the filtration mode of operation, the water
will always flow from the top to the bottom. Clean, filtered water
is able to pass through the filter through a lateral or under drain
that contains slots to hold back sand.
Cleaning is an important process of maintaining your sand filter in
order for it to operate at optimum level. It is also important to
extend the life of your other pool equipment.
The sand filter is cleaned by reversing the flow through the filter
to the "waste" line. This process is known as backwashing. The
filter should be cleaned on a regular basis, approximately once a
month. You should carefully read your filter instructions to learn
how to reverse the water flow in
order to properly clean the dirt and debris from the filter.
The sand in a crushed sand filter should be replaced every three to
five years. Of course, this would depend on how often the pool is
used during the season and the types of contaminants in the air that
come in contact with your filter.
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