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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 is also the only manufacturer whose underdrain is all
stainless 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 3M-134 industrial grade
epoxy coated ductile iron - 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.
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Backwash valves can be ordered for manual,
semi-automatic, or automatic operation.
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
controls help 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 Filtration - For 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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