18 REVERSE OSMOSIS INSTALLATION AND USER GUIDE BARRIE ● ONTARIO ● CANADA 705.733.8900 WWW.EXCALIBURWATER.COM Rinsing the Reverse Osmosis System • Slowly open the Reverse Osmosis Feed Water Saddle Valve fully counter clockwise. • The Reverse Osmosis Holding Tank Valve should be open. The Reverse Osmosis System is now making water. • Do not use the first three full Reverse Osmosis tanks of water. TECHNICAL DATA Reverse Osmosis water quality is normally measured with a TDS meter. The more dissolved solids in the water, the higher the conductivity. The results are usually reported in Parts per Million (ppm) or Milligrams per Liter (mg/l) of Total Dissolved Solids (TDS). (Although technically they are not exactly equal, in most discussions ppm = mg/l) Reverse Osmosis Membranes are rated by the amount of dissolved solids that are rejected. This rating is a ration of the TDS in the feed water to the TDS in the product water and is reported as Percent Rejection. If the feed water contained 100 ppm of TDS and the product water contained 10 ppm of TDS, 90 ppm have been rejected and the reject ration is 90%. Percent Rejection = Feed TDS−Product TDS Feed TDS EXAMPLE: Feed water is 500 ppm TDS and the product water is 75 ppm TDS. Percent Rejection = 500 – 75 x 100% 500 Percent Rejection = 0.85 x 100% or 85%
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