gtrestoration, when you say you were able to rule out the limewater as the source, does that mean that the limewater did not cause the algae problem?
"I was able to rule out the limewater as the source."
could be read as:
1. rule out that the limewater is the source
2. rule out other variables and determined that the limewater is the source.
I know literally, 1 is more accurate, but not sure if you meant 2.