Figure 2-75. Backwash Water Tank
After backwashing, adjust brine water level in tank to 7 inches. You may have to drain water from tank
or operate ROWPU normally until you obtain 7 inches.
Check for 7-inch brine water level with telescoping aluminum mixing paddle. Paddle has a 7-inch mark
for checking the brine depth.
Begin by adding 1 lb of citric acid to water in backwash water tank and mix with aluminum paddle until all
granules are dissolved. (More citric acid may be added laterto bring pH of brine near but not below 3.5.)
If in the past, when using the same source water, brine has been very
alkaline, then more citric acid may be added to start; however, never let
pH of brine drop below 3.5.
Remove backwash hose from outlet of the backwash pump and connect VENT VESSELS hose to outlet
of backwash pump.
Make sure REGULATE PRODUCT FLOW valve is open.
Open VENT VESSELS valve. This valve should remain open at all times except when producing