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Everfilt's underdrain is hydraulically balanced
to assure efficient collection of filtered water. The lateral collection
screens are matched to the natural flow of water through the filter.
It also means that during backwash, the filter bed is lifted uniformly
and fully, thus achieving complete cleaning and regeneration of
the media.
 The
high strength profile wire screen retains medias finer than No.
20 silica sand, thus eliminating the need for filter back-up screens.
The non-clogging characteristic of the screen makes it the most
reliable collection system available.
Everfilt's underdrain is all steel construction and fully welded.
The added strength results in years of trouble-free, reliable operation.
Heavy-Duty Backwash Valve - Everfilt's
backwash valve body is made of high strength ductile iron and is
coated with industrial grade epoxy - a material known for its resistance
to corrosion. All wetted surfaces are stainless steel or epoxy coated.
The hydraulic design prevents valve slamming and eliminates possible
damage to the valve and manifolding.
Backwash valves for media filtration can be ordered for manual, semi-automatic, or automatic
operation.
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Automatic Backwash Control
Everfilt
designs and manufactures its own automatic backwash controls. User
friendly control knobs, panel labeling and display lights make for
easy use. Made of solid state electronic circuits, the automatic
controller helps assure effective system operation by initiating
needed backwash in an efficient manner. The control can be set to
trigger backwash either when a specified pressure differential or
time interval is reached. The control is housed in a water resistant
enclosure.
An optional LCD readout indicates when the next backwash cycle
is timed to begin, the total number of backwash cycles that have
been initiated since last reset, and the number of backwashes that
have been triggered by pressure differential. Users find this information
very useful in identifying operating conditions requiring their
attention.
Models are available for 4, 8, 12 station controls. Thus, in some
cases it's possible to expand an existing filter installation without
the expense of changing controls.
Deep Bed Media Filtration - For filtration applications
where slow, deep sand filtration is required to achieve low micron
filtration, a high jacket tank is available. Consult the factory
for specific sizing.
Solar Power - For field conditions
where electric power is unavailable or unreliable, or where it is
just more cost-effective, Everfilt offers a 12-volt DC solar power
option. The heavy-duty battery has the capacity to deliver power
to the system even in overcast weather.
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