slimy pool bottom and sides...high chlorine

[Melbal]

I have ordered the test kit. I plan to begin this regimen on Sunday. I still don't understand the muratic acid instructions . Sorry the pH is currently in range along wih alkalinity. The chlorine is really high but I am still on vaca and can't test with the new drop kit. If the PH is in range when I get started on Sunday do I still add the borax and muratic acid? Or do I just do the bleach? Am I trying to lower the CYA at all?
I will purchase the borax and muratic acid as needed I am just not sure why I am doing that.