The softened water is a bit yellow, is that normal?
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The water coming out of the water softener has been relatively clear in the past few days, but today it suddenly turned a little yellow. The hardness test was 0.02, which is within the acceptable range. What is the cause? Resin problem? Or the backwashing was not thorough?
Is it caused by rust in the tank and pipes after it has been shut down for a period of time?
I suspect this is the reason, but there is no change after leaving it for a long time.
Cause of rust, send sample for testing if it is normal or not
Check whether the turbidity of the incoming water exceeds the standard? If so, troubleshoot pretreatment water inlet and equipment problems (filter). If the turbidity of the incoming water is qualified and the corrosion problem in the parking pipeline is eliminated (usually the inside of the tank is anti-corrosion and the pipeline is also lined with rubber or anti-corrosion), there is a high probability that there is a problem with the cleaning of the resin tank (open the resin grab point to observe).
For municipal tap water, the only water treatment equipment is a fully automatic water softener, which contains resin. Anyway, it uses industrial salt and nothing else.