I let some of my 55 gal drums develop algae from sittin outside (emptied before a move and NOT re-filled - OOps!) under direct sunlight for a few years. Here's what I did.
Use a non-scented Clorine Bleach. It does wonders AND it sanitizes the barrels to boot.
Use your own judgement on how much of it you use to clean em. It doesn't take a lot of clorine to do the job. I simply poured about half cup into them, added water (enough but not a lot) to swish out the barrels. I let em sit for a while after rollin em around. Then I rinsed em with clean water and refilled em. Good to go!
And JIC - I have a Berkey "Light" if I have to "filter" any water at all.
"In the beginning of a change the patriot is a scarce man, and brave, and hated and scorned. When his cause succeeds, the timid join him, for then it costs nothing to be a patriot". Mark Twain - 1904
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