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Backwash Valves
DE Filter Push/Pull Valve (Backwash)
Position: When the push/pull
handle is in the up position, the filter reverses the flow allowing the dirty water to go
out the waste line or backwash hose.
DE Filter Push/Pull Valve (Filter)
Position: When the push/pull
handle is in the down position the filter is filtering the water and returning it to the
pool.
SAND Filter Push/Pull Valve (Backwash)
Position: When the push/pull handle is in the down position the filter
reverses the flow through the filter sending the dirt to the waste line or backwash hose.
SAND Filter Push/Pull Valve (Filter)
Position: When the push/pull
handle is in the up position the filter is filtering the water and returning it to the
pool.
Types of Backwash Valves
PUSH-PULL
VALVES
The push-pull
valve, also called slide valves, mounts on to
bulkhead fittings on the side of a Sand or D.E.
filter. The advantages of a Push-Pull valve are that they are
simple to use, simple
 to understand, have very few parts, and
are less restrictive to water flow than the multi-port valve.
Push-Pull Valves use
a plunger with two disks (see diagram
above). The only action is to
either pull the handle up, or
push the handle down. Sand filters usually operate in filter
mode with the plunger in the up position, and backwash by
pushing the handle down (always shut off pump before changing a
backwash valve). D.E. filters are usually in filter mode when the
plunger is down, and backwash by pulling up on the handle.
When you pull up or
push down on the plunger of a push pull valve, you are reversing
the direction of water into and out of the filter. (which is
where we get the word "back-wash").
How
Long do I backwash my filter for?
Backwash until the water runs
clear out the waste line. Usually about 2 - 3 minutes. You may
need to add water to the pool before or after backwashing. On a
D.E. filter, the last step is to add the fresh D.E. powder to the
filter, through the skimmer.
When
do I need to Backwash?
When the pressure gauge indicates
a pressure rise of 8 - 10 lbs above the clean, or start-up
pressure.
What
Maintenance do I need to do for my Slide Valve?
Lubricate the valve o-rings at least
once per year. Remove the plunger from the valve body and apply
a Teflon based lubricant like
Magic Lube.
Help!
My Slide Valve leaks out the waste line all the time!?!
You most likely have "blown a gasket".
Remove the plunger from the valve body and inspect for broken or
missing disc o-rings.
 Multiport
Valves
The
multiport valve, also called MPV valves,
mounts on to bulkhead fittings on the
side of a Sand or D.E. filter. The
advantages of a Multiport valve are that
they have, well, multiple ports. This
allows for more options than simply
Filter or Backwash.
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