Hydroponic and DWC reservoirs need to be refilled to be just under the netpot so that your plants roots are submerged as much as possible. When using synthetic nutrients, the pH tends to fluctuate and most times, it will drop so mixing in som pH up or down allows you to replenish the water while simultaneously balancing your pH. This recipe also adds hydrogen peroxide to keep your buckets sterile and Epsom Salt for additional magnesium in veg.
The method of using this type of feed starts with refilling your reservoir with this solution, then adding your juices:
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Vegetative Juice: https://www.howweedgrow.com/hydro-vegetative-jucie-feed-schedule-dwc
And finally, pH balance your reservoir.