MARLO MATD 9500 XT, Manual

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5
SALT and CAUSTIC REGENERATION
Steps 1 - 3 are the same in this calculation.
4. From the capacity chart Figure 2 for Ionac ASB-2 using 50% alkalinity and 400 TDS the
capacity is approximately 8 kgr / cu.ft.
This should be downgraded by 10% 8 kg-r x .9 = 7.2 kgr / cu.ft. 5.
5. To calculate the throughput capacity
(7.2 kgr x 1000) / 11.7 = 615 gallons / cu.ft.
6. Leakage will be approximately 10 % of the influent alkalinity, 20 ppm CO, or HCO
3
as CaCO
3
.
The calculation to determine total carbonate alkalinity leakage when caustic soda is used as
part of the regenerant is as follows:
2 x P alkalinity = Carbonate present
MO alkalinity - (2 x P alkalinity) = Bicarbonate present
Carbonate alk. + Bicarbonate alk. = Total Carbonate Alkalinity Leakage
For immediate regeneration type meter control the meter setting would be at 15,000 gallons.
Commonly this value is adjusted to 90 percent of the actual value (in this example 13,500
gallons) to assure not over-running the softener.
For time delay type meters the amount of gallons is determined as in our example except an
additional amount of gallons must be deducted from the actual gallons to allow soft water to be
available until the softener regenerates at he selected delay time of day or night. This
compensation is necessary since the meter will indicate regeneration-required time prior to the
set delay time.