Bruce-

Good question. To date, I am not aware of any scaled down Hypo system on the market. Since it is rare to have a small pond with such depth, the market for such an item is not enough to support the design work required.

Yes, hypos when placed at a depth greater than 35 feet will have the same effects. The TVA has experimented with many different methods of increasing 02 at depths greater than 35 feet and the best solution they have come up with is pure 02 pumped through soaker hose at depths greater than 35 feet.

You may be able to acheive the same results using a hypo housing but pump pure 02 opposed to atmospheric air. Of course the homeowner would not want to have a tracktor trailer of oxygen delivered every week to keep that system running.

As an aquaculturist, you may understand this option: Build a compressor house on the bank, pull water up from the Hypo and let it go through an 02 concentration cone that is connected to an oxygen generator. As the water passes the pur 02 generated by the system, it is gravity fed back into the hypo...just a brain storm.

Anyways, it was a good question.