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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 (941) 555-0142.

When Black Algae Needs Professional Treatment

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.

• Dark spots that resist brushing and shock
• Raised, crusty patches on plaster or grout lines
• Spots return in the same places after treatment
• Growth concentrated in shady or still corners

Our Black Algae Treatment Process

Every colony gets brushed hard with a steel-appropriate brush to break the protective coating — this step decides whether treatment works.

Black Algae Treatment Cost in Sarasota

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.

Why Kingfisher

Why Choose Kingfisher Pool Care

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, nearly two decades in the trade, licensed and insured (FL CPC 1459221), 4.9 on Google, and same or next-day starts.

4.9 on Google 187 verified reviews

20+ Years, one local owner Serving Sarasota & Manatee

Licensed & Insured FL CPC 1459221

Our own certified techs Never subcontractors — photo checklist every visit

The sooner colonies are hit, the shallower the roots. Call (941) 555-0142 or send photos of the spots below. Learn more about how we work, what we charge, and who we are on our homepage.

Ready for a Worry-Free Pool?

Homeowners across Sarasota and Manatee counties 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 (941) 555-0142