How can you have algae in RO ...

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How can you have algae in RO treated water? Are you storing it in open to the air and exposed to sunlight?  Also, there should not be much N or P nutrient so algae  should not grow much. It must be seeded after the RO treatment. Algal cells are large and often aggregated and would be removed by the RO unless it has a hole in it.  Add some chlorine and it will kill the algae.

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