# 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?

= 110 Kg NaCl   (150 Gram NaCl / liter of resin)

so quantity of water require to dilute @100% solution

= say 344 Liter Water { solubility of NaCl  (320 Gram NaCl @ 20 Deg C / liter of Water )}

to get 10 % solution add 3440 liter of water

Now 3784 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 hardness 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.

### 74 throughts on "How to Calculate Resin Capacity for Softener | Softening Plant?"

1. Sphinx says:

How to Calculate Salt Quantity?

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

Is the above calcualtion wrong?
150 Gram NaCl x 727 = 109.05 Kgs of NaCl

Please correct me if I am wrong.

1. zenv says:

109.05 kgs is correct, thanks to point it

2. please give me softner plant vessel size calculate

Thanks & regards

paresh patel

M – 9898665184

from – B T water treatment pvt ltd in gujarat

1. K. Venu Ravi says:

Sir please send me how to calculate softner vessel, and resion capacity .
Thanking you sir.

2. mohan says:

600mm x 1875mm height

3. Satish pal says:

how to formula of new softener design

4. Shaik imam pasha says:

Correct sir

5. Mangulu says:

what is the meaning of 727

727 Liter

2. Sphinx says:

Also please let me know what is the purity of NaCL you have considered in the above calculation

1. zenv says:

80 to 85%

Sir, tds is 1059ppm and daily need 2000lit water plz give the resin qty and vessel size for daily recharge and also give salt qty to recharge. Awaiting reply.

Dear sir
Your information more help full to take knowledge.

4. Jerry says:

please wats the best approach to this design question

Design a water softening plant for a water work having the following data:
Hardness of water= 450 mg/liter as CaCo3
Available hardness after treatment = 50 mg/liter as CaCo3
Quantity of water to be treated = 25000 liter/ hour
Ion exchange capacity of resin to be used in the plant = 10 kg of hardness / cub.m
Salt required for regeneration of resin= 45 kg/ cub.m of the resin
The water softening plant works 2 shifts of 8 hours per day. Assume any suitable data where necessary.

thank u

1. calculation resin quantity

Liter of resin = Feed hardness in ppm * Water quantity in M 3 per hr/ Exchange capacity

Calculation of salt in gm = 150 gm of salt per liter of resin* quantity of resin in liters

Calculation of salt in Kg = 150 gm of salt per liter of resin* quantity of resin in liters/1000

5. Navin says:

What would be the efficiency of hardness removal we could expect? From say 800 ppm by this method how much hardness can we remove and what would be left?
Thanks
Navin

6. yethiraj says:

WHAT IS THE PRESSURE DROP FOR USING 1000 LPH SOFTENER BY USING 10X54(Dia. x Height) with multiport valve. eg. inlet pressure is 2 kg / cm square, what is the output pressure after softening

7. nitesh says:

how to calculate the hypo dosing in wtp?????

1. T.MURUHARAJ says:

Feed flow X Required ppm x Plant Running Hrs / 10 x 6 (% of hypo chemical)

8. What would be the efficiency of hardness removal we could expect? From say 800 ppm by this method how much hardness can we remove and what would be left?

1. our flow rate 30 m3/hr and Hardness calculate for resin is 320 ppm. But inlet hardness is vary from 250 ppm to 700 ppm and we use the softener vessels is 48×72 and resin qty is 1210 ltr. and our Obr is 200 m3/ hr. so after regeneration we got hardness only 20 ppm but party required less than 5 ppm so, what we do.

1. Md. Abu Sayem says:

Please make NaCl solution by Soft Water for regeneration and Keep Another Softener vessel on the basis of 20 ppm hardness. i think it ill solve this issue.

We have 20 m3/hr Softener tank and our Raw water hardness 95 ppm and TDS 1080 ppm Kindly suggest the recipe how much resin required and how much NaCl is required for soften it?

1. naveen says:

hallo sir we need Building construction water softeners desining

2. KUNAL KALE says:

Hardness is 95 say 100 PPM. your flow rate is 20 m3/hr take regeneration after every 24 hr i.e. after 480 m3. because your hardness is not much.
kg load of CaCO3 is 48 kg. i.e. if we take exchange capacity of resin 55% resign require will be 875 lit.
NaCl required will be 135 kg for each regeneration

1. T.MURUHARAJ says:

Mr Kunal salt 131 kg enough

i need frp softner base on 150000 ltr soft water every day on 700 ppm
pls suggest

11. we have done a sea water treatment three months before. raw water dds is 15550 after water treatment we get 55ddsppm. But a problem arises.a
aferr having the water it caught the throat please. give solution.

12. kamaraj says:

How to calculate the resin exchange capacity.

I have one 1354 Vessel and one 40nb multiport valve. I want to design a softner of 1000 lts/hr capacity. The hardness is 450 ppm. The above material is suitable for this capacity of softner. Please help me in this. And what is the Re-Generation time. Please explain me.

14. mumrao says:

haredness is 800ppm , requirment of water 25 m3 per day please send resin qty and salt qty.taken water

15. KUNAL KALE says:

How to design the D.M. Plant?
How to calculate the resign requirement (Anion & Cation)?
What should be the free-board or may I use it as packed bed?
In my knowledge 30% should be freeboard is it OK?

16. KUNAL KALE says:

Hardness is 95 say 100 PPM. your flow rate is 20 m3/hr take regeneration after every 24 hr i.e. after 480 m3. because your hardness is not much.

kg load of CaCO3 is 48 kg. i.e. if we take exchange capacity of resin 55% resign require will be 875 lit.

NaCl required will be 135 kg for each regeneration

17. Shanmugam says:

Dear sir, here we had 15m3/hr plant, our raw water have 300ppm hardness and 800ppm tds, after softening we get result 5ppm but with in week get high hardness, per day feed 100m3. Y this happening?

18. Mahedrakumar sharma says:

Above information increase my knowledge thank of all team

19. Mahbub says:

I need 30 m3/hr softener plant . Hardness need to reduce fro 350 ppm to less than 5
1. Tank size ?
2. Resin quantity?
3. Salt for regeneration how much ?

Thanks
Mahbub

1. kd SINGH says:

We can give you the softener quote if u wish

20. Pushkar says:

How to calculated the raisin quantity based on tank capacity.

21. mani says:

how to design softener vessel with a capacity of 5m3

Sir,
For 800m3 softener how much we have to use please explain.

Sir,
For 800m3 softener how much resin we have to use please explain.

1. Jana says:

You need to say also Hardness of Water in PPM

24. shankar says:

useful info thanku

25. Sathish says:

I want frb vessel size and resin quantities for all vessel size pdf sent me sir

26. Sathish says:

One hour 10, 000 liter outlet softener water which size vessel and resin quantities

27. Dear sir, Raw water hardness is8450ppm . I want softener design like resign qty and salt calculation. The flow rate is 2m3/hr

1. Jana says:

Resin Qty= 307 ltr

150 Gram NaCl / liter of resin

Therefore = 46 Kg Salt

1. Anshu Bhardwaj says:

above calculation is wrong.

1. Resin Qty.= Plant capacity*raw water hardness/Exchange factor (55).
= (2*24*8450)/55
= 7375ltrs (Theoritical)
Practical value = (2*20*8450)/55
= 6145 Ltrs (Approx. 6150)
2. 150 gram Nacl/Litre of resin qty.
= (150 gm*7375)/1000
= 1106 kg Salt (Theoritical)
Practical value = (150 gm*6150)/1000
= 922 kg salt required.

2. J.Sarkar says:

Interesting ,Willing to see your process of calculation .

28. Tayyab says:

Thanks

29. chirag says:

25m3/hr resin qty 7000 liter now softener regenration with 1250 kgs nacl but after regeneration hardness is 50ppm client is required less then 5ppm please reply how to solve this.
Note what is regnration time?

30. victor says:

1500 liters resin which ejector to be used

1. T.P.Sivanandan says:

Vacuum type ejector

31. Sunil gour says:

sir piz suggest me softner for folowing condition1,total hardness as CaCo3 -1500 (2)TDS 5000 (3) SO4 2800 (4)Chlorides 400 ppm

1. Sunil gour says:

sir perday demond of soft water is max 15m3

32. I need 10 m3/hr softener plant . Hardness need to reduce fro 350 ppm to less than 5
1. Tank size ?
2. Resin quantity?
3. Salt for regeneration how much ?

Thanks
Sanjay

33. 10 m3/hr softener plant .
Hardness to reduce fro 400 ppm to less than 5
P/z say the
1. Tank size ?
2. Resin quantity?
3. Salt for regeneration how much ?

Thanks
Sanjay

34. 10m3 softener sir p/z say the resin quantity and tank size,
salt for regeneration

35. Dear sir
300 m3/hr capacity softner plant for textile how much resin is required and if three vessel and each 150 m3/hr than what will be vessel size

36. Alex says:

Need to know the lts of resin for 1248 vessel (1000lph). Hardness is 175. TDS 1400

37. Aleem says:

Sir please mention that my plant capicty is 10m3 and water hardness is 380 how much resin is used and how much salt is used in regeneration sir please tell answer sir.and tds of fees water is 670

38. Vinesh says:

Dear sir ion exchange na225 resin qty 100 ltr and inlet ppm 650
So what obr and how calculate obr plz sir formula

39. vikas tiwari says:

i have 50 liter resin to how to use of quntity in 1000 liter water .

40. Rohit Das says:

Can anybody suggest what is the pressure drop to consider per meter of resin bed ?

Dear sir

softener sir p/z say the resin quantity and tank size,
salt for regeneration

42. R.K. DWIVEDI says:

WHAT IS EXCHANGE CAPCITY

43. Rafa says:

150 litres resign
hardness == 400-500ppm
whats the output of water from softener in litres with less than 60-70PPM hardness until the next regeneration process ? 18k litres or 20k litres ?

44. ganesh says:

sir,
what ever your giving information is very use full me. i want to how to calculate vessel sizes.

45. SAHIL MAHAJAN says:

resin quantity and nacl calculation required for 100 cubic meter water
inlet hardness 200 ppm
kindly do the calculation for this

46. filtrex technologies pvt ltd says:

we have 9liter softener inut hardness 450ppm ,how many liter soft water we will get out put.

47. Murugesh k says:

Sir,
How to calculate the water velocity in loop line(PW/ WFI).

48. ashvini saxena says:

what qty of cation resin required to replace 34kg Ammonia from water solution. Ammonia is in the form of Di ammonium Tartrate MW 184

49. Kishor Kumar says:

Hi sir.. We install softener plant vessel size 956*1856mm. We fill Resin 250 kg the problem we facing lossing pressure and some time ?????? line will broke.. What is correct pressure we need.. Pump is two hp. Plant is in fourth flooor.. Please advice the correct pump capacity