PWTAG Technical notes are updates or new material for the standards and guidance given in the PWTAG book, Swimming Pool Water and the PWTAG Code of practice and should be read in association with these publications.
Any pool can be exposed to algae – especially an outdoor pool. As sunlight encourages algal growth, outdoor pools are particularly vulnerable.
Foreign objects like canoes can introduce algae. Phosphates often used in detergents and cleaners and also added to some water supplies to reduce plumbosolvency, can also encourage algal growth.
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