Re: So you want to add borates to your pool--Why and How
I don't recommend it. Most ways to add borates also affect pH, and since you can't measure pH during a slam you wouldn't be able to monitor this. Also, borates is considered an optional improvement to water feel with minor algae inhibiting properties. It is not a panacea, and will not help with your SLAM. The single most important thing you ca do to prevent algae is maintaining continuous FC above minimum for CYA level.