Fish don't much like chlorine. It generally kills them, even at low
concentrations ( 1ppm).

Rich wrote:

I just did a spring cleaning of the pond for the fifth year.
How can I kill the allege on the sides?
I used a high pressure sprayer and cleaned it the best I could.
My boss adds Chlorine a teaspoon per day to keep his down but he has a 20
gal plastic. I have a 500 Gal 3 ft deep.

Any Suggestions
Rich