Hempy bucket, passive hydro. Much cheaper, easier and a mostly fail safe method of growing your favorite flowers and veggies. Otherwise, GH makes the Water Farm and the Power Grower. I own the latter and it works well if that's just what you gotta do. I used it once and went back to Hempy Bucket.
The water farm/power grower are actually DWC bubbler with a drip ring. The air bubbles push water up the tube and around the drip ring and feeds the hydroton from the top. It's a very simple and effective system. I like it. Just Hempy is so much less trouble and worry free.
Good luck.