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7800 Greensand Filter Installation & Startup Guide
cases it may need to be replaced or cleaned, if there is suction at the control valve, but no
permanganate is being drawn in.
4. If there is NO suction at the control valve port where you removed the permanganate tubing,
then the injector should be cleaned.
5. If the injector has been cleaned and there is still no suction check to make sure there is obstruction
in the backwash line; that the backwash line does not go up and over the greensand filter more
than several feet (which causes pressure loss and the injector not to work correctly); finally check
to make sure there is enough pressure. If possible increase your water pressure to the iron filter
from your well pump and see if a slightly increased pressure makes the injector work. We
recommend a minimum 30 PSI but it does work better if there is 40 to 50 minimum PSI.
System Not Backwashing Adequately
The second main problem that may occur is if you do not have enough backwash flow rate to properly
clean the greensand filter. You can verify the backwash flow rate by running the drain line into a bucket
and timing it when the 7800 is in backwash. A 1.0 or 1.5 cubic foot system should have 5 gallons per
minute and a 2.5 cubic foot system should have 10 gallons per minute of backwash.
Potassium Permanganate Tank with Float
Page 16
www.cleanwaterstore.com
Rev 120214
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