Greg:

Thank you for the advice. You and Dave have been both very helpful. I looked up Bob's book and it looks like something I should have for my library. I'm going to get it.

I will have a lab do the test of the pipe water. I honestly don't believe there is a problem, but it's better to be safe. I just don't want to contribute to any more weed growth with a pipe leaking heavy nutrients.

I will also use Greg's guide on the Ph factors. Are nitrites or ammonia anything to be concerned with? And, beside weed chemical effectiveness, does water hardness have an impact on ponds?

Thanks again, to both of you for your advice. And, if anyone else out there would like to offer some advice or imput, I would be very grateful.