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19. Press the Extra Cycle button for a second or two which will start a manual backwash. If you ever wish
to stop a backwash in progress, just push the Extra Cycle button once, and within 30 to 60 seconds
the control valve will change to Rinse cycle. Press the Extra Cycle button again, and it will skip
through the Rinse cycle to Service mode, meaning it is in service and ready to use.
20. 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 Fleck 2510 bypass valve knobs are a little stiff, so you can use a screw
driver placed in the holes to turn the knobs. Make sure you are turning the bypass valve knobs in the
correct direction (counter-clockwise) as you face the bypass valve knobs.
21. There should be no Calcite media coming out of the drain line, but the water will be milky or dirty
looking. At this point the Neutralizer filter is in a backwash cycle which will take 10 minutes. If the
water slows down or stops during the first 10 minutes of backwash, press the Extra Cycle to move the
Fleck 2510 control to the next cycle, the Rinse cycle. Then repeat the backwash and rinse after the
rinse cycle is done by pressing the Extra Cycle again. If you have high water pressure you may need to
turn on the water to the neutralizer slowly at first to prevent some Calcite fines from coming out the
backwash. It is normal for a small amount of fines to come out during the backwash, but you do not
want to see a large amount of media coming out as this means you have very high water pressure or
the drain flow for the Fleck 2510 is missing.
22. If possible verify that the backwash flow is 5 gallons per minute, the recommended backwash flow
rate for 1.0 and 1.5 cubic foot models. If you have a 2.5 cubic foot neutralizer it should be
backwashing at 10 gallons per minute. You can easily run the drain hose to a bucket and, using a
watch, verify the flow rate in gallons per minute. An adequate backwash is critical to properly clean
the Calcite media and prevent it from cementing together.
23. The next cycle is the Rinse cycle and this also runs for 10 minutes.
24. After the neutralizer has gone through the backwash and rinse, press the Extra Cycle button and
repeat the backwash and rinse. This is the same procedure that needs to be done each time you add
Calcite media in the future; the Calcite media must be thoroughly backwashed and rinsed.
25. Refer to your Fleck 2510 service manual for more information about how your control valve is
programmed if desired.
Maintaining Your Neutralizer 2510 Filter System
1. Check the pH before and after the neutralizer. You want to have a pH of at least 7.0 after the
neutralizer filter.
2. If the pH drops below 7, check the depth of the Calcite media by shining a bright light through the
tank. Your tank should be about 2/3rds full of media. When the media level drops to ½ full, it is time
to add more Calcite or Calcite blend media if you are using a blend.
Page 9
Fleck 2510 Neutralizer Installation & Startup Guide
www.cleanwaterstore.com
Rev 062714
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