Hempy buckets are a form of passive hydro. The original was all perlite, but people do soil / perlite blends, straight soil, straight coco. Basically a bucket with no holes in bottom, but one hole on the side two inches from the bottom. Fill with perlite to the hole, and the rest of the way with your medium of choice. I have settled on 1/2 soil, 1/2 perlite. Your water from the top, and the volume of the bucket below the hole acts as a reservoir for the plants. Nice and simple. Usually uses a really simple salt fertilizer. There is tons of info out there if you Google it.
PS, I saw in a different thread of yours that you are using the tall Folgers cans for your plants, that is a proven hempy container. I collect them from my neighbors haha. 
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