Hi everyone,
I'm in some desperate need of help here. I've had a RO unit for a long time, however, I've recently moved and I'm on a well. My incoming TDS is about 650. The thing that is really confusing me is the drain water coming out of my RO drain line is 1000. After membrane I'm getting 100 TDS which is only 90% (all brand new filters, including membrane). Why is the TDS on the drain line on my RO unit much higher than my main line?
I'm in some desperate need of help here. I've had a RO unit for a long time, however, I've recently moved and I'm on a well. My incoming TDS is about 650. The thing that is really confusing me is the drain water coming out of my RO drain line is 1000. After membrane I'm getting 100 TDS which is only 90% (all brand new filters, including membrane). Why is the TDS on the drain line on my RO unit much higher than my main line?