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I can't think of anything that will flourish in the conditions you describe that wouldn't be taken of by boiling. Toxins must be created by some organism, but if the organism itself can't start growing first, there's no risk of ingesting the toxin.

But you do mention algae. I don't have any experience with RV's or trailers, but can you actually get algae growth in the water tanks when maintained properly? I would think it would require sunlight to encourage algae growth.


I think you and the others are probably right. Bleach + Boiling should do the job. As far as algae goes, the water tank on the trailer does receive indirect sunlight, but it will probably take more than 3 months to take hold. I guess I'll find out later this summer.