Blancherd, You are kinder than I am in regards to this.
KCK, I don't know how much you know or understand about Koi, but many of the people on this board spend hundreds if not thousands of dollars on fish. Call it high end if you will. However you classify it, I would like to think that we here have a larger interest in taking the well being of our fish to the max. To-where to-witt most of us have put a great deal of thought into the construction of the fishes habitat. While he strive to maximize the Redox Potential of the water there are many basic ways or doing so without resorting to magic boxes. Proper stocking, Good pond design, Correct maintainance and Sufficiant water changes will do more than and bit of exotic kit hooked up to the hose will achive. Furthermore in will do it consistantly and without failure or breakdown.
Getting back to the black algae issue... If you have a pond with black algae in it, you should be banned from keeping koi uintill you get yourself straitend out.
The old saying that brings all the hair on our necks overend comes to mind. "trust me, I'm a dealer"
Now that I think about it... you know who you should get to test this for you? Roark!
Go to
www.click2roark.com ,
sign up and read his site. Then email him or check out the forum
http://www.click2roark.com/cgi-win/w...ion=wbgetindex
Mind you if you ar selling snake oil, he'll eat you alive but a fair an honest opinion you WILL get
B.Scott