DIY rocks in local waters

[notyet]

has any body made any DIY rocks and then let them cure in local waters? i know i have read on RC about many people leaving them in local streams/rivers in order to get the pH down... not sure if doing that in local waters would introduce any unwanted algaes, hitch hikers, etc...

any one have experience here?

 

[DgenR8]

I'd worry more about contaminants, especially near land, and anywhere near boats.

 

[dougwilliams]

All the rock I made I just let cure in rubbermaids in the backyard. I left the hose in which never shut off all the way - so there was a very (very) very slow drip and cycling of water. It was only a few weeks before mine were at a decent pH.