Why do I need to reduce my backwash flow rate?
If the backwash rate for an ion exchange system is set when the water is warm, the flow rate will be too high when the water temperature is cold. Anion resins are more susceptible to this problem because their densities are lower than cation resins. Your ion exchange supplier should have curves of each resin in their literature.
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| Example of Backwash Flow Rates and Bed Expansion Chart Purolite C-100 |
Please note, each resin will have a different backwash rate, so look in the manufacturer's bulletins for the correct value.
How do I prevent this from happening?
- If you have a backwash valve with a position stop, decrease the flow rate to the correct value at the colder operation temperature.
- If you have a backwash controller with rubber inserts, remove and plug enough holes to decrease the flow rate to the correct value at the colder operation temperature.
- Install a resin trap in the backwash line of the system. If there is any media carry-over, it will be trapped, hence the name.
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Some of the Numerous Flow Controls and Flow Inserts Offered by Res-Kem
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| Res-Kem Manufactures Resin Traps for 2", 3" and 4" Piping to Prevent Resin and Other Media From Contaminating Downstream Equipment |
Need Help?:
Contact Res-Kem if you need help determining what needs to be done or to have us service you equipment.
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