Dear Ebrahim Mohamed ...

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Dear Ebrahim Mohamed Salama ,

You did receive nice suggestions here considering chemicals, storage conditions, nutrients concentration and new equipments. I just want to add two more options, assuming that you already have algae contamination in raw water:

1- Evaluate a DAF as a pre treatment (or maybe as a clarifier, as well)

2- I am doing some research about ultrasonic aplication in raw water, also to reduce the upstream contamination. 

Best regards.