Those black-green spots dotting your plaster aren’t dirt, and they won’t brush off — black algae anchors roots into the surface and grows a protective coating that shrugs off normal chlorine. Owners fight it for months; the spots fade, then return in the same places. We treat it at the root. Call (407) 555-0144.
Black algae shows up as small dark spots — often in shaded areas, rough plaster, and corners with poor circulation — that feel raised or crusty. If you’ve shocked the pool and the spots came back, that confirms it: shock kills the surface layer but the roots survive and regrow. Every week it waits, the colonies root deeper and seed new spots. It rarely arrives alone, either — a swimsuit or toy from an infested pool is the usual carrier, so we also look at what else it touched.
Every colony gets brushed hard with a steel-appropriate brush to break the protective coating — this step decides whether treatment works. Then we treat each spot directly with targeted algaecide and run the pool at high chlorine while filtering heavily. Colonies get re-brushed on follow-up visits until the roots die; skipping follow-up is why home treatments fail. We finish with a filter clean, since the filter is holding spores, and photo-document every stage.
Cost depends on how many colonies there are and how deep they’ve rooted — a few early spots cost far less than a pool-wide infestation. Send photos and we’ll quote it free, usually the same day, including the follow-up visits in the number upfront. No contract, and we tell you honestly if the plaster damage underneath will need work.
Black algae humbles weekend fixes — beating it is about method and follow-through, which is what our certified techs bring. In-house crew, never subcontracted, 20+ years in the trade, licensed and insured (FL #C-40218), 5.0 on Google, and same or next-day starts.
The sooner colonies are hit, the shallower the roots. Call (407) 555-0144 or send photos of the spots below. Learn more about how we work, what we charge, and who we are on our homepage.
Most jobs are quoted free from photos — usually the same day.
Homeowners across the Lakeshore Corridor already trust us with their pools. Tell us about yours and we will get back the same day with an exact, no-pressure quote.
Call Us (407) 555-0144Usually quoted the same day — no contracts, no hard sell.
A certified tech will get back to you within 24 hours with an exact, no-pressure quote.
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