Pond Boss Forums MANAGING AN EXISTING POND Evaluating and adjusting fish populations Old pond renovation

I know nothing about the efficacy of chlorine as a fish kill product.

However, at the level required to be toxic to macro organisms like fish, you might kill off 100% of your small fauna and much of your algae and other beneficial flora.

Of course that could be beneficial if you were really trying to get an old pond returned to a clean slate?