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First I wanted to thank you for the post, I've found it very useful.
I was wondering what strength (milliequivalents per liter or ppm) buffer you are using on your dwc setup and how the plants are doing under these concentration.
I read your tips and I understand what you are saying about keeping the PH swings to a minimum or slowing them down and wanted to know how its working?
Also how often are you needing to make PH adjustments to your water?
I'm sure this would depend on what type of water someone is using. I find that my ph needs to be changed just about every day (I'm using RO water which practically has no buffering ability) and though your method would be a great way to not have to change it as much. This would also give me the chance to leave for the weekend without coming back to PH spotted plants.
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