I have built a Gravel bed which will be the first place the effluent goes after the fish tank. It will sit on top of the float bed under the Vertigro. It is a 12" x 12" by 10' fiberglass column sleeve.
I am filling it with Aliflor which is like Hydroton but cheaper. Here are some pics of the Gravel bed. I also created a photo album.
I cut holes in the top so it will still have support.
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