Probably getting a bit sidetracked from the main question but a sealed downpipe system means you can pretty much locate the tank anywhere you want, so long as it is below the gutter level, your fine.
A teaspoon of chlorine every time you arrive or add another 1500 bucks to install a UV filter if your concerned about possible contamination.
My vote is get the biggest tank you can or set your system up to add additional tanks later. You’ll eventually wish you had two of them anyway.
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