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Anyone have some input if medium ( clay pebbles, coco, perlite, vermiculite, etc. ) effects growth vs. DWC? If you're doing a top feed ( DRIP stake or RING ), is there any reason just having media would slow the growth down vs DWC? My experimental DWC is giving me some fits right now. I also...

I'm doing some DWC experiments, because I haven't touched the stuff in a decade. So I'm testing sterile vs. bennies for keeping the roots clean. I have no chiller, no plan to implement one, either. So on this one, I added some SA GFF and maybe??? some light malt extract. The pictures are...

I was wondering if there were any logical reasons adding top drip using an airpump drip ring, like GH Waterfarm does, if that adds anything extra to the efficiency of the setup. DWC... the water is hyper oxygenated, plenty of roots are submerged in the mixture, why would adding more water...