Kelly,
I found Catmandoo's post thought provoking:
Cody's comments really have me concerned. Some of you might remember my efforts to clean the edges of my pond during last year's drought.
and
After reading the posts above, I now have a fear that there are hundreds of pounds of copper products in the bottom of my pond.
If so, what do I do now?
I believe he was referring to these comments:
Some sediment chemistries can cause short term redissolving of bound copper depending on conditions
and
Lots of scientific info is available on the fate of Cu and other heavy metals in the environment. Cu is on the hazardous chemical list for at least three gov agencies. Its use in lakes and ponds as an algacide has been banned in several states with probably more states to follow suit as more scientific information becomes available.
Since dredging an entire pond seems to beyond the scope for most, I was wondering if keeping the "alkalinities" at or above 300ppm (per Miss U) through the addition of Ag Lime(?) would be reasonable (ie., the Cu that is present "deactivated")?
Seriously, though, a good read.
