Okay guys so I recently purchased a 5 stage RO DI filter from BRS alond with the 3 TDS readers. All was working great at first, but now I’m getting 1TDS reading from the 4th stage which was normal with my water(reason I upgraded to 5 stage) but now I’m getting a reading of 6TDS after the 5th stage? I thought the TDS meter was absolutely wrong. I came to see it was not wrong after testing it with 2 other TDS readers? Definitely cleaner coming out of the 4th stage. The filter is not a month old and was working fine before. Any ideas or help will be greatly appreciated.