Hi Johnson, I think preventing bacteria at the early stage is better than destroying it after it has formed to algae. It is, of course, unpleasant to watch an algae affected pool in your backyard. I just saw this informative blog which could really help pooI beginners. http://www.soldapools.com/blog/swimming-pool-tips/remove-black-algae-pool/ I also have a pool and I took the following 3 measures to keep my pool free of black algae.
Scrub with a steel bristle brush
Shock with granular chlorine
Add some metallic algaecide.
Hope this could help you.