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Is anyone aware of an off the shelf system that will automate a drain to waste grow? I've been looking around and I haven't seen one yet. I started my first coco grow 6 months ago and quickly realized that the frequent fertigation took up a lot of time. So for the last six months I've been...

I doubt that the pump will turn on automatically. There is going to be very little pressure between your drain trays and the pump. Most pressure sensors will require at least a couple psi to activate and I doubt you will have that. I have been using these little pumps, and they work great...

I have a similar automated system set up....although without the nutrient mixing aspect. One solution to the problem of evenly distributing the mix to each plant is to assign each plant it's own pump. You can use cheaper/smaller pumps when each plant has it's own pump so the system might end...

If you can get access to a 3D printer, these drip manifolds I designed work well. They are meant to be used with a lower volume pump like the one in the picture. The pumps are cheap, seem to last a long time (I haven't had one fail yet), and work great when you pair one pump with one manifold...