Hey Massproducer, have you ever thought of converting this into a full system by using 1/4 supply line, a drain for run-off and a big res that could supply 12 or more of these buckets for a week or longer.
It seems like you could set it to fill the buckets every 2 days with 1 gallon or so of water and just make up new solution every week, making it a true automated hydo system with much more redundancy than a normal system given how infrequent you would need to irrigate.
Maybe its possible to even just sub-irrigate as well.
I know it sounds like more work to setup, but really you could do a system like this with 48 plants and only have to work on them once a week when its dialed in. I'd love a system that grows 12 plants of 4 different strains (48 total) with 4 res's that I only change once a week. Since its drain to waste, there is no messing with PH every week. Yet your water usage would be decreased significantly over any other drain to waste, and your nutrient usage would be reduced too.
Think about it, for 48 plants to make it a week, you'd only need close to 100 gallons (or less, im probably over exaggerating) a week to make it work.