Of course you wouldn't drink it, but the calculation for us is to take the smell away, the problem is how to mix it, suppose you can pump it around. we have a small 2000 litre cisterna on a small house we rent & if after the winter it hasn't been used we put some in, also used it on larger ones that have been standing, it works well but might sting a little in the shower so make sure you go easy on it & round it down.