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7800 Greensand Filter Installation & Startup Guide
24. Set Day - Use the up and down arrows to select the proper value. Once the proper value is set,
press the Settings button (Enter) to proceed to the next setting
25. Set Regen Days - Set the number of days between backwashes, typically for every 3 days for
moderate to heavy iron. If the iron level is low and water usage is light you can try setting it for
every 4 days, but a setting of every 2 days is recommended by the manufacturer. If your iron is
very high (over 4.0 ppm) and you use a lot of water you can set it to every night. Frequent
backwashing prolongs the life of the media by several years.
26. Gallons On/Off – Select Off to program it to be used as an Iron Filter
27. Regen Time - Set the time of the night that you want the Greensand filter to backwash. The
default time is 2:00 am. Adjust the time by pushing the up or down arrow if you want.
28. Programming Complete – If you need to go back and change anything, simply press and hold
the Settings button to go through the programming menu again.
29. Now you are ready to turn on the water. Turn on the water and leave the Greensand filter on
bypass and check for leaks. Leave the ball valve after the Greensand filter closed, so water is
still off to the house, but connect a garden hose and open up the hose bib after the Greensand
filter and allow the water to run for several minutes. This important step clears out any foreign
material that may be in pipes from the installation. If you do not have a valve and hose bib
installed after the Greensand filter, you will need to turn the water on inside the house to let
the water run. Use a bathtub or laundry sink or other fixture that does not have an aerator
screen.
30. Press and hold the Manual Regen button for three seconds which will start a manual backwash,
watch the display and wait until it starts counting down. Now unplug the power supply and
proceed to step 24.
31. Now you can slowly turn the bypass valve to the service position. You do NOT remove the red
clips on the bypass knobs in order to turn the bypass valves from the bypass to the service
position. First open the Inlet Side of the bypass valve. Second slowly open the Outlet Side of the
bypass until it is in the full service position. The 7800 bypass valve knobs are a little stiff, so you
can use Allen wrench placed in the holes to turn the knobs. Turn the bypass valve knobs in the
correct direction which is counter-clockwise as you face the bypass valve knobs.
32. There should be no Greensand media coming out of the drain line, but the water will be black or
dirty looking. At this point the Greensand filter will be in a backwash cycle. The backwash takes
10 minutes. If the water slows down or stops during the first 10 minutes of backwash, press the
Manual Regen button to move the 7800 control to the next cycle, the Rinse cycle. Then repeat
the backwash and rinse after the rinse cycle is done, by pressing and holding the Manual Regen
button for three seconds again. If you have high water pressure you may need to turn on the
water slowly to the Greensand filter at first to prevent some Greensand fines from coming out
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