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I don't know about stealth... sounds like an honost question to me.
[QUOTE wondered if you had any advice on this and if her claim (the biologist) was true that increased oxygen also helped reduce black algea][/quote]If you find black algae in a pond then something is totally wrong. In a proper pond the algae is green and short, not black and slimy.
Oxygen addition is something that is needed on a constant basis and not just momentarily while topping up the pond. We strive for a constant balance and stability in our ponds not a momentary quick fix and then back to the main program. Using something like this is either totally unnessasary or, if needed, a sign of a very poorly designed pond. Such a pond could increase O2 levels in many other simpler, healthier and less expensive ways.
My advice is to save the money unless she sells them herself.
B.Scott
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