Smithsonian Institute: "Algae are photosynthetic organisms that occur in most habitats, ranging from marine and freshwater to desert sands and from hot boiling springs to snow and ice. They vary from small, single-celled forms to complex multicellular forms, such as the giant kelps..."
Algae grows in most any environment, but is photosynthetic. Flood clear water-filled tubing with light, you have the perfect algae farm. Kill the light, algae can't possibly survive.
Also, using boiled water is a proven (think canned foods) strategy for preservation.
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