US Water Systems Defender 223-DFROM Series, Owner'S Manual

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The RO system is designed to operate at specified flow rates to ensure longevity of the membranes and per-
formance. It is best to set the RO system to operate at its ’ designed flow rates but in some cases due to feed
water temperature and TDS (total dissolved solids) level, the designed flow rates may not be achievable.
Please see the definitions below to understand the adjustment procedure and the RO system;
Permeate – The clean water being produced by the RO system
Concentrate – The dirty water being rejected from the RO system to the facility drain
Concentrate Recycle – The rejected concentrate water that is returned to the pump inlet to be re - processed
through the RO system
Rejection Rate – The percentage of contaminants being rejected by the RO system. This can be figured by
taking the incoming TDS value and the Permeate TDS value and using those measure-
ments to do an efficiency calculation. The calculation is as follows;
IN - OUT/IN*100 = % of rejection.
Recovery Rate – The amount of feed water that is being used and not wasted to the drain. This rate is fixed
on standard systems. System with a concentrate recycle feature and be adjusted to a spec-
ified recovery rate. The maximum recovery rate that should be targeted is 75%.
Flow Meter – There are 3 flow meters on the system. These flow meters are called rotometers. There is a
stainless steel meniscus that floats in a glass block to at a specific level that can be measured
using the scale on the glass blocks. The flow meters have a gallons per minute scale and a
liters per minute scale. The value should be read at the top of the stainless steel meniscus.
Pre - Filter Gauges – There are two gauges on the pre - filters that are used to monitor the inlet pressure and
the pressure drop across the pre - filters on the RO system. When there is a 10 PSI dif-
ferential in these readings, the pre - filters should be changed. If either of these pressures
fall below 30 PSI while the system is running, the system will shut down due to a low
pressure fault. This is usually indicated by a red LED light illuminated or digital display
indicating a pressure fault. This system should not be operated with low pressure. The
low pressure switch should not be adjusted to a lower pressure or the RO booster pump
could be damaged.
Pump Pressure Gauge – This gauge is on the front of the RO system and is used to determine the system
operating/membrane pressure. This reading is important when adjusting the RO
system.
Pump Throttle Valve – There is an adjustment valve on the RO system booster pumps. This will either be a
slotted adjustment screw on the smaller systems or a gate valve on the larger sys-
tems. This valve is used to adjust the pump pressure.
Concentrate Valve – This valve is used to regulate the amount of water that is being directed to the drain
Concentrate Recycle Valve – This is the valve used to control the amount of concentrate water that is re-
turned to the pump to be recycled through the system.
Flux Rate – The rate of flow across the membranes in the RO system. This rate must be maintained or con-
taminants can precipitate on the membranes and cause them to fail prematurely.
Glossary of Terms
3. Make sure the toggle switch on the injection pump is in the “ ON ’ position.
The anti - scalant pump will operate when the RO is running. This pump should self prime during the start up
procedure. The solution tank can be topped off with 10 more gallons of mixed solution once the RO system is
online. Be sure to mix the solution correctly when topping off the solution tank. The mix is as follows;
Future tank fills can be done using the RO water produced by the new RO system.
NOTE: It is a good practice to mix the anti - scalant solution weekly to ensure the solution concentration
stays consistent.
US Water Hyper - Guard Plus 7000 Anti - Scalant Mixture
RO GPD Rating Initial Fill for Entire 15 Gallon Tank Ongoing Fill Per Gallon of Refill RO Water
2,000 13.5oz 0.9oz
4,000 32oz 2.1oz
6,000 35.5oz 2.4oz
8,000 44oz 3oz
12,000 88oz 5.9oz
Based on Hyper - Guard Plus 7000 Anti - Scalant. 3 GPD pump, 15 gallon tank.
NOTE: Stir the tank weekly to keep the solution from separating.