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Water Softeners and Softening Resins

How long is the backwash time for a Water Softener?

Minimum backwash time is 5 minutes. Generally the backwash time is factory set at 10 minutes. If the water is not clear then the backwash time can be as long as 20 minutes.

How long is the brine and slow rinse for a Water Softener?

This depends on the salt dosage selected for the softener. The default setting is 60 minutes.

Salt Dosage, lb/cuft Brine and Slow rinse Time, minutes


10 80
15 100

How long is the Rapid rinse for a Water Softener?

Rapid rinse is typically 10 minutes minimum.

How long does the brine refill take for a Water Softener?

This time is a minimum of 4 minutes.

What is the total time to regenerate a water softener?

The total to regenerate is between 1.5 to 2 hours.

Would soft water be preferred over hard water as a feed for a residential RO system as calcium has a higher molecular weight than sodium?

Hardness is easily precipitated as a scale on the membrane surface as the pure water is removed by the membrane.  For residential membranes, the removal of the hardness may prolong the membrane life if the soft water is used.

How often should I change the resin in a water softener?


Softening Resin Life (Approximate):

No chlorine:   8 years

Chlorine:   3-4 years

How do you dispose of the resin in a water softener?


Softening Resin Disposal. It is a non-hazardous product that you can throw out with regular trash.


I have a brine tank that is at a low level, how much salt do I need to add and how often does it need to be added?


The brine tank should be filled with salt to slightly above the water level. The tank is self filling, so no additional water needs to be added. Check the tank regularly, and add salt as necessary to maintain the proper level of salt.

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All Content on this site is  intended for informational purposes for experienced water treatment professionals only.  Applied Membranes, Inc. does not assume any liability for any damages caused by the misapplication or misinterpretation of any of the information contained on this website.
Applied Membranes, Inc. 2007