Page 5 Fleck 9100 Nitrate filter Start-Up Guide Clean Water Systems 2009
current time of day and program the nitrate filter with your water hardness. NOTE- “hardness”
must be calculated based on your nitrates and your sulfates. See below to determine what that
value of hardness is for you to enter. When programming add 2 or 3 grains of hardness to your
water hardness as a safety measure if you have iron in the water.
How to Calculate How Often to Set System to Regenerate:
Example: nitrate as nitrogen is 10.0 ppm or 44.4 ppm as nitrate;
Change nitrate to nitrate as nitrate by multiplying times 4.4
Test for sulfate and note sulfate level.
Example calculation:
Nitrate level (as NO3):
44 ppm x .81 = 36 ppm as CaC04
Sulfate:
34 ppm x 1.04 = 36 ppm as CaC04
Total sum of N03 and Sulfates as CaC04: 72 ppm
72 ppm divided by 17.1 = 4.2 grains (round to 5 grains for conservative calculation)
Capacity of resin = 16,000 grains per cu ft
Total cubic foot of resin in system: 1.5 cubic foott which = 24,000 grains
24,000 grains divided by 5 grains = 4800
Add in a safety factor to prevent the resin from becoming exhausted each time before regeneration. The safety
factor would be the maximum amount of water used in one day. Typically use 80 gallons per person per day. So a
four person home would be 320 gallons to use as a buffer or safety factor.
So the nitrate filter in this example would be to set it to regenerate approximately every 4480 gallons.
12.
Start a manual backwash by pressing and holding the Extra Cycle button for 5 seconds. After
nitrate filter has been regenerating for 20 minutes, look inside the brine tank, and you should
see that is has sucked out the brine. At the end of the regeneration (90 minutes) check to make
sure that the nitrate filter has added water to the bottom of the brine tank to make brine for the
next regeneration cycle.
