Around 200uS
Depends on your water source also db. You can only do so much. Even when I was dripping 250 gallon per day of only pure ro in the system is was still only able to get it around 100 . Amazon river water is around 10-30uS not possible to maintain in an aquarium
Also db ill tell you a story of when I first started testing with Tds and conductivity meters. My first reading was a Tds over 1000. My rays didn't breed and cichlids would all get hole In head.
Here's some steps
-prevent evaporation
-remove water and fill old fashion way
- instal reverse osmosis
-lighten the biological loads waste contributes to solids
-instal the best particulate filter possible something that can polish your water effectively very low micron at a high rate
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