How to calculate resin capacity.
The chart below lists capacities for new ResinTech resins on once-through systems based on the following assumptions:
1. The pH of the solution to be treated is between 6 to 8.
2. The endpoint of the two-bed cation/anion is 100,000 ohm.
3. The endpoint of the mixed bed run is 1 megohm.
4. One micromho conductivity equals 0.5 ppm TDS as CaCO3.
5. Virgin resin regenerated to Nuclear Grade specification minimum.
The capacity per cubic foot for any of the above resins can be calculated:
(CAPACITY in kilograins/cu.ft. X 17.1 grains per gallon per ppm x 1,000 grains per kilograin)
(MICROMHOS CONDUCTIVITY x 0.5 ppm per micromho)
For example, to find the capacity of cation resin on a 400 micromho conductivity water, using a 10% safety factor:
(36 x 17.1 x 1,000) = 3,078 gallons/cu.ft.
(400 x 0.5)