Osomalator Metering Pump is putting out something

this is me

Active member
I've been running my osmolator system for over two years and absolutely loved it. I've always tested the TDS in the RO/DI reservoir when it's full and when it's almost empty. I never had a problem until recently. I tested 50-60TDS from the almost empty reservoir. The container is always sealed though it is clear. But if you start from 0 TDS water, there's nothing can be grown from the light. First I thought it was the container so I changed the container. But I'm still getting the same reading after the water has been pumped out. This is in a two weeks time frame from a full container to an almost empty container.
So, I came to the conclusion that the pump must be putting out something. Any suggestion on how to solve this problem?
 
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