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To add Zero water or add zero water. Hmmmm

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I been running dwc for years here in south . but just recently got a good grip on water conditions and plant growth .  In (10 Gallon RDWC system)  If the Ppm remains the same ,and the Ph remains the same<6.0>, should I add fresh <zero water>  to top off every day? < water lvl is not problem with 10 gallon res for one plant. when I do ppm goes down and  Im not sure if that's a bad or good thing. 


Merry Xmas 

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@condo I’m interested to see the responses. I’m thinking about doing a DWC next run


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