US Water Systems american revolution, Installation And Maintenance Manual

Page: 10 / 17

Installation Instructions
Residential Reverse Osmosis Drinking Water System
Page 10
Water production
PRODUCT WATER RATE
Usable water production from an RO system is designated
product water rate , produced on a daily basis. The rate is
normally described in gallons per day (gpd) or milliliters
per minute (ml/min).
REJECT WATER RATE
The flow of water to drain is designated as reject water
rate , as measured in gallons per day (gpd) or milliliters per
minute (ml/min).
Using a graduated cylinder the formulas are:
REJECT RATIO
The reject ratio is the amount of water produced
compared to the amount of water flowing to drain.
The formula is as follows:
PERCENT RECOVERY
The
percent recovery
is another way to measure the amount
of water produced compared to the amount of water which is
actually used.
The formula to determine percent recovery is as
follows:
NOTE:
Product water rate is the sum of the feed water
flow rate and reject water flow rate.
For example:
Water pressure and temperature
Product water quality and production of RO systems is
dependent on pressure and temperature. Typically, RO
membranes are treated at standard conditions of 77°F (25°C)
and 60 psi (4 bar) discharging to atmosphere. In general, the
higher the pressure differential and temperature, the greater
the quality and quantity of water produced. These factors
should be considered when sizing RO systems for a particular
application.
Quick connect fittings
Many RO systems utilize Quick Connect fittings. These user-
friendly fittings provide superior performance and may be
provided with this system. Proper use of these push-in fittings
is shown below. Along with these fittings, all tubing selected
must be of high quality and must be cut with a plastic tube
cutter or sharp razor with a clean, square cut.
How to make a connection:
1. Cut the tube square
Cut the tube square. It is essential that the outside diameter
be free from score marks and that burrs and sharp edges
be removed before inserting into fitting. For soft thin walled
tubing we recommend the use of tube inserts.
2. Insert tube
Fitting grips before it seals. Ensure tube is pushed fully into
the tube stop.
Milliliters per minute x 0.38 = gallons per day
Ounces per minute x 11.2 = gallons per day
Product water rate =10 gpd
Reject water rate = 40 gpd
Feed water = (10 gpd + 40 gpd) or 50 gpd
Percent Recovery = 20%
Reject Ratio =
Reject Rate
Product Rate
Percent Recovery
=
Product H
2
O Rate x 100%
Feed H
2
O Rate