how can i build a drip feed system with a resiovoir outside the grow room. the plants need to be in theire own 5 gallon buckets filled with hydroton and cant be on a table because of heght issue. the highest the buckets can be is about 6 inch
A water pump in the reservoir and a line of tubing running through the wall into the grow room and fixed to your drip system?
I must be misunderstanding what you are wanting to do. The water wouldn't go back into the reservoir, it would be dripped onto the soil.
I figured I was missing something I believe you could drill the bottom of each bucket and put a 90 degree PVC fitting. Combine those using some black tubing and some splitters and feed them into a condensate pump. These pumps usually have a small reservoir on them with a float inside so once there was a small amount of water in them they will kick on and pump until the float goes back down (often used on furnaces and whatnot).