When you add the borax and muriatic acid, is it a one-time application? Or do you have to keep going back and fiddling with it? We've gotten rid of our mustard algae (but it rained again today) with high CL levels consistently, and now it's either time to start adding Polyquat or go the Borax way. I need easy. I will tell you that I don't like dealing with muriatic acid, I just don't - chemicals that smoke as you open them scare me. So if the borax is a one-time application (per season) I can go that way, or do the Polyquat.

Recommendations?