been wide acceptance for the application of
Caustic Soda (Sodium Hydroxide) for the
treatment of industrial and potable waters
in recent years. The use of caustic soda
serves to raise the pH of well water which,
untreated, is typically acidic and damaging
to distribution system piping.
Adding caustic soda to potable water is
generally accomplished using a metering
pump. However, caustic soda can crystallize
causing problems in pumps using check
valves. Diaphragm pumps represent the most
widely used caustic soda metering pumps, and
typically rely on four(4) internal check
valves for operation.
Any crystallization of caustic soda will
begin to affect the sealing of the check
valves causing backflow, which will directly
affect pH control accuracy. If the pumps are
turned off for an extended period of time,
the caustic crystals can cause valves to
As a result, the pumps need to be taken out
of service and rebuilt, at considerable
expense and downtime. In high demand
applications, this service may be required
Fluid Metering’s "CTS” Valveless Chemical
Treatment System uses a unique valveless
piston technology. A single rotating and
reciprocating ceramic piston accomplishes
both the pumping and valving functions,
thereby eliminating the need for check
valves and the associated maintenance.
Sapphire-hard internal ceramics insure that
there is no degradation in accuracy over
time and no need to recalibrate. At a
fraction of the size and weight of pumps
typically used for caustic soda and soda ash
water treatment, FMI’s space-saving design
measures 10” x 5” x 5”, weighs only 10 lbs,
and can be wall mounted. Operating on less
than 100 watts of power, the unit virtually
pays for itself in energy saved, often in a
few short months.
Celebrating 50 years of valveless fluid
control, Fluid Metering, Inc. manufactures
metering systems for a variety of critical
water treatment and monitoring applications.
These include soda ash addition, sodium &
calcium hypochlorite injection, lime
addition, rhodamine dye injection and more.
No valves to service.
No loss of prime from out-gassing.
Ability to prime against line pressure.
Months of “no touch” service = fast payback.
Variable Speed DC Controller
Provides 0-90 VDC power for FMI variable
speed 90 VDC metering systems
Selectable manual or electronic 4-20mA
input speed control
Maintains & resumes output settings
following power interruptions
Gasketed NEMA 4/12 enclosure
Input Power 120 VAC