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Question about avoiding contamination when growing chlorella Vulgaris

 
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Hi all
I'm investigating growing Chlorella Vulgaris to eat in an earthship. The water would come from a rainwater harvesting system. The tank containing chlorella would be next to an aquaponics system containing fish and salad crops. What I want to know is that given that the water will be close to a neutral PH what measures do I need to put in place to avoid contamination by other unwanted organisms, such as harmful cyanobacteria or salmonella and how much do I need to sterlise the rainwater harvesting system? Also do I need to avoid cross contamination between the aquaponics and the chlorella. Also  are there any methods that make it easy to tell if contamination has happened?
 
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