I heartily recommend the Sanders units, and if you don't use a dryer column (I don't)figure that the output rating on the unit will be reduced by 50% due to moisture in the air. I am using a Sanders 200 mg. unit on a 230 gal. system fed into the venturi on my Tunze skimmer with a Tetra Luft pump to make sure I am getting enough throughput...without the pump I don't get sufficient tiny bubbles in the contact chamber.
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