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Is it possible to buy huge underwater tanks and have these installed on your land? If you have a large garden for example, it could be plausible to dig it up, install a tank the size of a cargo container, put the plumbing in and re-bury it. Maintenance may be an issue down the line, but otherthan that you've got a fantastic source of multi-purpose water (although I wouldn't drink it!)

Does anyone know if equipment like this is sold for the residential market? And would you need some kind of planning permission?

I've heard some people say it is and some people say it isn't. Which is true?