Green algae is the most common — free-floating, sanitizer-responsive. Mustard (yellow) algae clings to shaded walls and resists normal chlorine. Black algae embeds in rough surfaces and requires mechanical removal plus elevated sanitizer levels.
Our approach: identify the species, match the treatment, and document chemistry before, during, and after. We do not leave until the pool is swimmable and we provide a prevention protocol for your plan.