You don't seem to understand:

If you don't kill the algae, your water is not safe no matter WHAT filtration you use! You cannot filter your way to sanitary water! Better off to drain the pool and not use it.

I cannot help you if you will not listen to what Ben and I have to say and I will not attempt further to help you. We are all volunteers here and give of our time freely.

Best of luck to you!