Advice from your local pool service company
Color and location provide clues, but treatment should be based on the complete condition
Green algae often colors the water or creates slippery growth. Mustard or yellow algae may appear as dusty patches in shaded areas and can return if affected items are not addressed. Dark spots called black algae can be difficult to remove and may penetrate porous surfaces.
Not every colored mark is algae. Metals, scale, leaves, fertilizer, plaster discoloration, and surface damage can look similar. Brushing response, water chemistry, location, texture, and a controlled test help narrow the cause.
Effective treatment usually combines brushing, adequate sanitizer, circulation, filter cleaning, and repeated follow-up. The pool should not be declared recovered simply because the water changed color.
Items to compare
- Green water and surface growth
- Yellow or mustard-like shaded patches
- Dark embedded-looking spots
- Sanitizer and circulation correction
- Cleaning of filters, tools, toys, and affected accessories when appropriate
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Frequently asked questions
Why does algae keep coming back?
Recurring algae can involve inadequate sanitizer, poor circulation, dirty filtration, missed brushing, high stabilizer, hidden growth areas, or contaminated accessories.
Can I treat every algae type the same way?
No. Severity, surface, chemistry, and likely organism affect the plan. Diagnosis and label directions matter.