Hi Alex,  The three key ...

Hi Alex, 

The three key conditions for algae to grow are light, nutrients and water temperature, so tackling these is key.

If you have a body of water >10 m deep then stratification can occur naturally during warmer times of the year, and promotes algal growth. Reservoir mixers are a good option for preventing stratification and so reducing algal growth.

Historically, people used copper sulphate, and I think it might still be used in swimming pools and the like, but it's not very environmentally friendly, so I think its use in raw water has been paired back. 

Phoslock is a product I have heard trialled in the UK for raw water algal management, so could be of interest to you. It binds to phosphate in water and then sinks to form a layer of sediment.

Catchment management to reduce the concentration of phosphates entering water bodies is a more sustainable approach, but is challenging, and depends on by-in from landowners etc. 

There is also ultrasound, which is thought to disrupt the buoyancy of algal cells, which means they sink, and don't get sufficient light.

There are others, but hopefully this gives you some leads.

Regards,

Fiona