adding new D.E. powder after backwashing, but
you can test this at any time. The best method
to determine the cause is to remove the grids
and clean/ inspect thoroughly.
and manifolds vary by manufacturer, and can be
expensive. $25 per grid; up to $100 for a manifold.
Labor is usually under one hour.
handy with an awl, torn grids can be sewn instead
could be a problem with your multiport or push-pull
valve. The valve could be allowing water to bypass
the filter and return to the pool unfiltered.
Perhaps you are not running the filter long enough.
Perhaps there is not enough D.E. powder in the
filter, or too much. You may also need to backwash
the filter or remove the grids and clean them
manually. Poor sanitation, poor water balance,
and pool circulation could be another cause,
and it could have nothing to do with the filtering
at all. Remember: filtration + sanitation + circulation
long should I run my filter each day?
just as much as you need. Careful experimentation
will show you when the water quality begins to
suffer. Many people with smaller, older equipment
(filter/ pump) run their systems 24 hours per
day. The average (I would guess) would be about
16 hours. BUT! It depends on your system. Undersized? Old?
High pool Use? Large Debris Load? Heavy Sunlight?
Any of these factors call for extra filtering.
If you're too frugal with the electricity, you
may have to pay more in chemical costs.
filtration + sanitation + circulation =
all work together.
D.E. filters have a belly band clamp with a large
O-ring between tank halves. The o-ring can become
distended or flattened and may need to be replaced if
water is dripping from the center clamp. Caution:
Do Not remove the center clamp while the pump
is running, and without first releasing pressure
inside the tank. You may notice your multiport
valve leaking in one or more areas. See sand
filter info on previous page. If your push-pull
valve is leaking out of the backwash port (where
the hose attaches), the plunger either needs replacement,
or a new set of o-rings.
by manufacturer. Around $90, plus 1 hour labor.
filters are more expensive than sand filters.
You may want to replace if
your filter is old and tired, or you may decide
to upgrade efficiency from a sand or cartridge
filter. Price varies by manufacturer; however,
as an example, we sell the Pentair
FNSP 48 for $479.97.
Filter of choice for most
spas, and many smaller above ground pools, the
cartridge filter is enjoying a resurgence in
popularity. The cartridge filter
element, an aquatic version of the pleated
air cleaner in your car, traps dirt and particles
of 25 - 100 microns in size. The cartridge
is removed from the tank and hosed thoroughly,
top to bottom, with a high pressure hose to remove
dirt when the pressure gauge rises 8 - 10 lbs.
above its clean reading. I know some people that
take their cartridges to the local self serve
car wash place for cleaning. Each time the filter
is cleaned, some of its filtering ability is
reduced. The cartridge should be replaced every
2 - 5 yrs, depending on the work it was asked
to do. If the filter was a bit undersized, and
had some algae every year and lots of tree debris,
etc. then it may last only 1 - 2 years. Nicely
sized cartridge filters can operate for 6 months
do I Backwash my Cartridge Filter?
trick question. There is no backwash valve on
a cartridge filter because today's pool filter
cartridges aren't built for backwards flow. Instead,
the pump is shut off, air bleeder opened, lid
removed, cartridge removed, hosed thoroughly
top to bottom, and replaced. It's a bit of a
pain to do, but hopefully the filter is sized
so that it's a 1 - 2 x per year job. Another
advantage is that cartridge cleaning doesn't
waste as much water as backwashing.
the cartridge in a TSP (trisodium-phosphate)
or similar solution prior to hosing will improve
your cleaning. Do not use TSP if you utilize
Baquacil or Soft Swim for sanitation.
of a clarifier or Chitin product like Sea-Klear is
a great help to a cartridge filter. Some people
also increase the filter efficacy by adding a
small amount of synthetic filter aid powder (1
- 2 cups) through skimmer. D.E. powder is not
recommended by most manufacturers, as it can
clog the pores of the cartridge.
the cartridge, its difficulty in maintenance
(no backwashing), and its low efficiency are
the reasons I don't recommend these filters for
use in most larger swimming pools. But for pools
under 30,000 gals., there are some nice filters
like the Hayward C-4000
that can really be a great filter.
off the shelf for $40 - $100, depending on its
size. No professional labor needed.
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