The Dark Side of Pools: Black Algae Survival Tactics

Black algae has a way of making even well‑kept pools look defeated. We dig into what it really is—cyanobacteria protected by a stubborn biofilm—why it laughs at normal chlorine levels, and how it burrows into plaster and Pebble Tec where a quick brush won’t touch the root. If you’ve spotted dime‑size black dots that keep coming back, this is your field guide to taking control without trashing your finish. We share a step‑by‑step plan that starts with breaking the biofilm using the right tool...