I have a two led water purity monitor for water tower. I open the faucet and push the test button, I just watch red led blink one time and it does not work at all. I do not know what is the correct led display way? I guess when you push the test button, the led will be on until you release test button. Now I do not know my monitor is bad or I need service for filter.
The LED monitor should light up as Green when the membrane is producing the proper water quality (80%+ TDS rejection). If the LED light stays Red this indicates the RO membrane is bad, all the filters (including membrane) should be changed and system sanitized. The batteries in the TDS monitor should be changed yearly also. Don't have a lot of faith in that indicator light. The best way to test for TDS rejection is with a digital TDS meter which indicates the amount of rejection. Compare the incoming water to the product water of the RO.
RJ
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