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Figure   2-72.   Backwash   Water   Tank
Figure   2-73.   Product   Water   Flow   Indicator

TM-10-4610-215-10 Water Purification Unit Reverse Osmosis 600 GPH Trailer Mounted Flatbed Cargo 5 Ton 4 Wheel Tandem Rowpu Model 600-1 Manual
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TM    10-4610-215-10 TM   08580A–10/1 (9) Remove product water hose (14, fig. 2-28) from product water tank and allow hose from ROWPU to drain on the ground. Leave brine water hose in backwash water tank. NOTE If element cleaning does not start, it maybe necessary to loosen draincock on backwash pump to purge air. Close draincock when pump is primed. (10) Within a few seconds, BRINE FLOW indicator (16, fig. 2-4) should show a flow of 16 gpm or more. CAUTION If  pH  of  water  circulating  through  R.O.  elements  drops  below  3.5,  element membranes may be damaged. (11) After 5 minutes, check pH (para. 2-32) of water discharging back into brine tank; it should be near, but not below, 3.5. If it isn’t, add another pound of citric acid and stir until all granules are dissolved. NOTE If in the past, when using the same source water, brine has been very alkaline, then  more  citric  acid  may  be  added;  however,  never  let  pH  of  the  water circulation through R.O. elements drop below 3.5. (12) Continue checking pH and adding 1 lb of citric acid at 5 minute intervals until pH of water is near, but not below, 3.5. (13) Allow citric acid solution to circulate for 45 minutes. Periodically check the temperature of the water discharging back into brine tank; use thermometer in Storage Box No. 2. CAUTION Temperature of solution will rise during element cleaning. At no time should it exceed 120°F. If temperature rises above 120°, stop recirculating citric acid solution and resume normal operation. (14) Stop recirculation by pushing the ELEMENT CLEANING switch down to OFF. (15) Remove VENT VESSELS hose from outlet of the backwash pump and connect BACKWASH WATER hose to backwash pump outlet. Drainage lagoon should be located downstream from unit. (16) Drain citric acid solution into a shallow man-made lagoon a reasonable distance away from the unit. Close valve at discharge of brine water tank (para. 2-66). 2 - 78







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