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Posted by Craven Morehead on July 26, 2006, 8:32 am
The original sand granules have sharp edges which tend to catch debris as it
passes. Over time (think years and gallons), these edges become rounded
off, thus reducing the ability to filter. Most filters have a pressure
gauge that indicates "back pressure" (my term) across the filter. This,
with experience, can help determine when the sand needs replacing.
1) Thoroughly backwash the filter. Then return it to normal service.
2) Note the pressure. If no gauge is present, install one.
3) Over a few weeks, note if the pressure rises and how much. Usually when
it increases 4-5 psi, the filter is getting clogged and it's time to
backwash.
As the sand loses it's effectiveness, the back pressure will not occur
because the filter is NOT getting clogged. THEN, it's time to change the
sand. My experience in Atlanta, is that I changed the sand after 6 - 7
years of service. It is not difficult. Filter is drained a day before,
then the top is removed and a wet / dry shop vac sucks it all out. Once
empty, inspect the plastic tubes (radials or laterals) inside. If one of
these is damaged it will allow sand to enter the pool, most notable on the
stairs. Replaced as required and pour in fresh sand from pool supply place.
BTW, I looked at the old & new sand under a microscope and could not see
much difference.
> Have purchased a home with an inground pool equipped with a Triton sand
> filter. The filter has functioned well for several years and been
> backwashed, as required.
>
> My question is whether the sand in these filters needs occasional
> additional quantities due to backwashing losses and/or whether the sand
> needs to be changed entirely on some schedule. The user manual for
> this equipment seems quite rudimentary and mentions nothing about
> maintaining/changing the sand, other than backwashing. Also, I can
> find no web site for the manufacturer, just a blizzard of store sites
> selling the equipment.
>
> Can anyone out there provide some guidance? and a link to a
> manufacturer web site?
>
> Thanks.
>
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