Best Answer - Posted by
Shreder
"Only done one dwc run but its kinda similar to coco.
Your ec goes up cuz u feed too much.
Your ph is shifting becuz well its what it does. And maybe your ec rising becuz of instable ph.
My 2 cents fill up res with water let sit with bubbler / circulator for 24h then add nutes. If using calmag it goes first.
Adjust ph to 5.6 after adding nutes. If it shifts up slowly its beneficial. Renew your res once it reaches 6.2 - i did so in my one dwc rub and it came out really well. No deficiencies at all with 5 different plants / seeds
Good luck
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