Furrow Pump, Inc. P.O. Box 1849 8525 SW St. Helens Dr. Wilsonville, OR 97070 Phone: (800) 937-3666 FAX: (800) 377-9960 www.furrowpump.com |
HOW TO INTERPRET YOUR JAR TEST RESULTS - Page 2The calculation formula we use to size a pump is a modified version of the rough sizing formulas given in HOW TO SIZE A CHLORINE FEED PUMP.
Example: You anticipate treating a maximum flow of 10 GPM. Your testing showed that your pipet delivered 25 drops per ml, and that it took 5 drops of the 0.005 % jar test solution to reach a residual of 0.5 PPM. You plan to actually chlorinate with a 0.5 % bleach solution. How many gallons of this solution would you need to pump in a 24 hour day?
As noted previously, you’ll need to at least double this jar test result to select a pump that operates around midrange. In this case you’d select a pump with an output of 12 GPD or more, and enough pressure capability to overcome your system pressure by 20 PSI plus. The example result of 5.76 GPD represents the amount of chlorine that would be needed if virtually every fixture in your house was on all of the time. In reality, a pump is on considerably less than an hour each day, so your actual chlorine consumption will be much less. If your concern is pH adjustment, the steps used to size a pump are much the same. Do the jar testing according to the previous instructions, and use the formulas above to calculate the PPM of test chemical needed for the pH change you want. If you used only a few drops of a strong chemical for the adjustment, you can do the calculations without adding to the water sample volume.
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