24
SALT DIFFUSION
Rev C
who monitor rejection levels, a spike of water with higher conductivity
may be seen when testing is conducted immediately after an extended
period of inactivity. Because of salt diffusion, rejection levels should be
tested when the system has reached steady-state operation.
Merlin Flush System
For highly demanding applications that require an alternate method to
lessen the effects of salt diffusion, a Merlin flush kit is available. This kit
includes a small tank that connects to the 1/4-inch light blue elbow on the
Merlin. The kit forces permeate water to flush the high salt concentrate
water from the membrane elements. By doing this, the system rests with
low salt concentrations on both sides of the elements. Because low salt
concentrations remain on each side of the membrane, salt diffusion is
greatly reduced. The kit uses approximately 0.7 gallons (2.5 liters) of
permeate water to flush the membrane elements each time it operates.
Figure 16 through Figure 20 illustrate the flush kit operation.
Salt Diffusion Flush Step #1 - Merlin produces water for use.
Figure 16
Flush Tank-Empty
Faucet On
Inlet
Drain
Merlin System in Normal Operation
Air
Prefilter
Element 1
Element 2
Post Filter