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Painting them, or covering them to block sunlight will also help reduce algae growth.
That's a great point. I plan on temporarily covering mine with a tarp, but eventually I'll have six with a "shed" built around them to protect them from the elements and also to keep them from being an eyesore. There will be an aisle down the middle to access the valves. I'll empty one each year watering the garden to keep rotating fresh water.
The totes are also great for making water efficient raised beds:
And an improved version of them here: New wicking bed