I used to get a small steady stream coming out of the clean water tube. Now I get a few drops per second. My 100 GPD unit produced about 8 gallons in a day. Seems to be clogged up. I don't know anything about these things so I decided I should ask what the problem might be before I tear it apart. Think it could still be the filters needing replaced even though it still tests 0 TDS
The water seems to be coming slower out of the waste drain, too.
Only had this unit a few months but I have used it quite a bit. I bought a new one because the last one did the same thing. Don't want to buy a new one again because it's probably fixable.