Complete Water Solutions performed a resin rebed recently on a triplex industrial softener. What prompted this rebed was the increased salt and water usage due to the decreased capacity. Over time water softener resin will loose its ability to soften the water – exchanging sodium ions for hardness ions. This decrease in capacity will set the regeneration trip point lower. Thus causing regenerate more, using more salt, and water. Lets take a look at the break down to determine if the resin should be replaced:
- 100 Cubic Feet Resin (Per Each Tank) 3,000,000 Grain Capacity
- 1,500 Lbs Salt Per Regeneration
- 1,000 Lbs Chloride Per Regeneration
- 6,744 Gallons Water Used Per Regeneration (Waste Water)
- 20 Grains Per Gallon Hardness
Annual Water Consumption
- 60,000,000 Million Gallons Water Used
Old Resin Set Points
- 79,000 Gallons Between Regenerations
- 759 Regenerations
- 1,138,500 Lbs Salt Annually
- 762,795 Lbs Chloride Annually
- 5,118,696 Gallons Of Waste Water
New Resin Set Points
- 150,000 Gallons Between Regenerations
- 400 Regenerations
- 600,000 Lbs Salt Annually
- 402,000 Lbs Chloride Annually
- 2,697,600 Gallons Of Waste Water
Estimated Annual Savings
- 359 Regenerations
- 538,500 Lbs Salt Saved Annually
- 360,795 Lbs Chloride Saved Annually
- 2,421,096 Gallons Of Waste Water Saved Annually
Looking at these savings it would appear that replacing the resin would be a great move. Complete Water Solutions recommended upgrading the resin from a standard 8% crosslink resin to a 10% crosslink resin. The higher crosslinked resin is more tolerate to chlorine which can help keep the resin lasting longer. Resin will loose capacity over time.
There are a few things you should due to make sure that it is the resin versus a mechanical issue.
- Brine Study – The first thing you can do is make sure that your softener is getting correct amount of brine. This can be done by performing a brine study. This is where you use a salometer and measure the brine concentration at the drain. During the brine cycle you would graph or record the salt %. A good rule of thumb is 30% for 30 Minutes
- Service Visit – We recommend scheduling a service visit this can help make sure that no other mechanical issues may be going on such as valve failure, meters, or other items that may reduce capacity. Many service companies can also perform brine studies, resin testing and much more.
- Resin Analysis – This is when you will take a sample of resin and send it off to a lab to have it analyzed. Resin analysis can provide information such as – capacity, moisture content, fouling, broken beads and much more. During this analysis they will also compare the sample to that of new resin and provide some insight as to the life or recommendation
Additional salt and waste water reduction:
There are also a few other things you could look at to help you with salt and waste water reduction.
- Brine Reclaim – This option provides mechanical controls to reclaim some of the spent / waste brine water and reclaims it back to the salt tank or silo. This allows you to reuse it again. It is not a good idea to reclaim all the salt water but a portion. This will reduce both salt consumption and waste water.
- Salt Saving Resin – Salt saving resin has been around for a while and allows you to regenerate with less salt per cubic foot. In most industrial applications the salt consumption is 15 Lbs per cubic foot. Some salt saving resin will reduce that from 10 Lbs to 12 Lbs per cubic foot.
- Hardness Analyzers – If your water source changes or fluctuates using a hardness analyzer can be a great way to save salt. Some water sources may have different hardness levels. Thus your softener capacity can change greatly based on the incoming water. Using a hardness analyzer it can monitor the outlet of the softener and when the softener is hard it can be tied into controller to force it to switch tanks and regenerate.