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Question about avoiding contamination when growing chlorella Vulgaris  RSS feed

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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?
No prison can hold Chairface Chippendale. And on a totally different topic ... my stuff:
five days of natural building (wofati and cob) and rocket cooktop oct 8-12, 2018
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