How to Calculate Resin Capacity for Softener | Softening Plant?

Before to Calculate the capacity of the Water Softener (softening) Plant,  to choose how much water to be softened. In this case, 100M3 to be softened at 400 ppm of Feed Hardness to 5 ppm.

How to Calculate the resin capacity? 

The Resin Exchange Capacity is mention into the product’s supplier Data Sheet*.

Normally cationic exchange capacity : 55/liter of resin.

Hence, Liter of resin = (Feed Hardness in ppm X Water Qty M3) / Exchange capacity

= (400 x 100 / 55) = 727 liter resin sufficient

How to Calculate Salt Quantity?

= 150 Kg NaCl { ∵ 150 Gram NaCl / liter of resin)

so quantity of water require to dilute @100% solution

= say 470 Liter Water { ∵ 320 Gram NaCl @ 20Deg C / liter of Water )

to get 10 % solution add 4230 liter of water  

Now 4700 liter is having for regeneration and that much of water to be injected 20 Minute

then start backwash process to another 40 minute

after that fast rinse until get harness is < 5 ppm once it is reached now the plant is ready to start the process, it can extract up to 100 m3

Feed pressure to be maintained up1.5 – 2 Bar,

*Resign exchange capacity is important, it is vary product to product.