I'm not sure what you're going to do on the hydro end in the tent, but that looks like the way I used to do Coco drain to waste.
I simply made a drain table out of some white PVC roofing and it had on a slight incline to one side where I had a gutter to collect the water and send it down under the table into a masons tub. And automatic sump pump would pump it out into my drain tile outside.
Then I had a 30 gallon Rubbermaid tote that I dropped a thousand liter per minute pump in and pumped out to Halo rings with half inch lines.
So all I really needed was a manifold or a splitter and a ball valve on each line to each plant to fine tune the amount of water it would get.
You can let the same pump that pumps water to your plants recirculate the water in your res by putting a simple ball valve and directing the water to stay in the rez. Then when you want to water you just reach into the res and switch that ball valve over.
J
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