Im looking for input and ideas for my latest venture. I plan to try and grow some outdoor hydro. I've got some long pieces of 4 inch pvc pipe for the plants to go in but I'm looking for ways to deliver the solution to the plants for 30 days or more so I only have to visit the site occasionally. I have thought about using some sort of drip system and let gravity do the rest. I've seen solar powered pumps but the collection grids are massive. Ideas anyone?????????