First, check if the inlet water flow rate is too high.
The first quick adjustment method for water softening equipment with high water hardness is to check the water flow rate. When initially manufactured, the flow rate of water softening equipment is marked with a specified standard value. Many users believe that opening the valve wider will increase the water output and efficiency, so they operate it beyond its capacity. Once the flow rate exceeds the standard, the water flow speed in the resin layer becomes too fast, and calcium and magnesium ions do not have enough time to be adsorbed by the resin. As a result, the hardness of the output water will naturally increase sharply.
Last month, a hotel customer was a typical example. They insisted on increasing the flow rate of their water softening equipment, which originally had a flow rate of 4 tons per hour, to 6 tons. As a result, the hardness of the output water remained above 0.3 mmol/L. When we went to check, we didn't even need to check the flow meter; we could tell at a glance that the flow rate was exceeding the standard simply by observing the degree of valve opening. So we adjusted the flow rate back to 4 tons, waited half an hour, and measured again. This time, the hardness had dropped to 0.02 mmol/L, firmly reaching the standard. First, check the flow meter to see if the actual inflow rate exceeds the equipment's rated value. This is the first thing you should do. If it does, turn off the valve slightly; don't touch anything else. Observe for half an hour, then measure the hardness. This should be effective about 80%.
Softening Water Equipment
Next, check if the brine concentration is too low.
The regeneration process uses a high-concentration brine to replace the calcium and magnesium ions adsorbed on the resin. If the brine concentration is insufficient, the replacement will not be complete, and the resin will continue to work as if it hasn't been properly cleaned. As a result, the hardness of the output water will naturally fail to meet the standard. Many users simply pour the salt in carelessly when preparing the brine, or the brine tank is not cleaned for a long time, causing the salt concentration to be diluted (click to view: the impact of adding too much or too little salt to softening water equipment). The actual concentration may not even reach 15%. The normal brine concentration should be controlled within the range of 25% to 30%. If it is below this range, the regeneration effect will be greatly reduced.
Use a salinity meter to measure the brine concentration in the salt tank. If it's below 25%, the salt mixture needs to be reconstituted, following the standard procedure of adding 250 to 300 grams of industrial salt per liter of water. After adjustment, regenerate once and then measure the water hardness. Normally, this should restore it to normal.
Next, check if the rinsing time is sufficient.
The rinsing process consists of forward and backwashing. Forward washing removes the waste brine from the regeneration process, while backwashing loosens the resin layer and removes impurities. If these two steps are insufficient, the residual brine and impurities in the resin layer will affect the adsorption effect. Forward washing should last at least 12 minutes, and backwashing at least 8 minutes; this is a standard setting for most equipment. Some users, in order to meet production deadlines, reduce the rinsing time by half, resulting in even higher water hardness.
You can check the rinsing program duration set on the equipment controller. If the duration is insufficient, manually adjust it to extend it. After adjustments, perform a regeneration process and then measure the hardness again. This usually results in a significant improvement.
Finally, consider whether the resin is aging.
If you've checked and adjusted the first three parameters, but the hardness still can't be reduced, then the resin itself is likely the problem. Resin has a lifespan, normally three to five years. With prolonged use, it can crack, age, or even become poisoned and ineffective, reducing its adsorption capacity by more than 40%. A simple way to determine if the resin needs replacing is: if, after adjusting the first three steps, the hardness still doesn't drop below 0.03 mmol/L, it's generally advisable to consider replacement.
Before replacing the resin, it's best to confirm the model and dosage before purchasing. Don't buy blindly. At the same time, check the inside of the resin container for impurities causing blockages to avoid problems after installing the new resin.
Large-scale water softening equipment
Summarize the troubleshooting order – don't get it wrong
Many people, upon noticing that the hardness of the effluent exceeds the standard, immediately assume the resin is faulty and should be replaced. However, after replacement, the problem persists. In reality, eight out of ten cases aren't resin-related issues; adjusting the parameters can solve the problem. The troubleshooting order should be as follows: First, check if the inlet water flow exceeds the rated value; next, check if the brine concentration is below 25%; then, check if the flushing time reaches 12 minutes and 8 minutes; finally, consider resin aging. Following this order will fix nine out of ten problems. Don't immediately spend money to replace the resin; complete the free parameter adjustment step first.
