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:
Reject rate
Reject ratio =
Product rate
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:
Product water rate X 100%
Percent recovery = Feed water rate
Note: Product water rate is the sum of the feed water flow rate and reject water flow rate.
Example:
Product water rate = 10 gpd
Reject water rate = 40 gpd
Feed water = 10 gpd + 40 gpd or 50 gpd
Percent recovery = 20%
Water pressure and temperature
Product water quality and production of RO systems is dependent on pressure and temperature. Typically, RO
membranes are rated at standard conditions of 77
F (25C) and 60 psi (4 bar) discharging to atmosphere. In general,
the higher the pressure differential and temperature, increased quality and quantity of water is produced. These factors
should be considered when sizing RO systems for a particular application.
PuROMax brand fittings
Many RO systems utilize PuROMax brand 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. Should a leak
occur at a fitting, the cause is generally defective tubing. To fix a leak, relieve pressure, release tubing, cut off at least 1/4"
from the end (square cut), reattach the tubing and confirm the connection is leak free. Each time a new connection is
made, it is advisable to cut off 1/4" from the end of the tubing using these fittings.
Conventional fittings
If PuROMax Quick Connect fittings are not used, it is essential to install
inserts
at the ends of all tube connections when
conventional fittings are used.
