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Hi Mat,
Understanding water purity and the humidity are similar concepts, I think.

One assumes that the the underlying concepts are relative to a set of conditions.

I infer that there is an understanding that aquaristically, water fit to drink may not be "pure" enough to use for breeding a given species of fish.

I understand your attention to the exact details.

apistomaster wrote:Hi Mat,
Understanding water purity and the humidity are similar concepts, I think.

One assumes that the the underlying concepts are relative to a set of conditions.

That's not quite how I would explain it, but I see where you're coming from.

I infer that there is an understanding that aquaristically, water fit to drink may not be "pure" enough to use for breeding a given species of fish.

There are several things that make water unsuitable for fishkeeping. The main ingredients in tap-water that I consider important to remove are:
1. Hardness.
2. Nitrate.

In my personal case, the second is actualy more of an isssue than the first. Hardness has an effect on breeding certain species of fish (those from soft water regions), but many fish are more adaptable than most people seem to think when it comes to hardness. However, removing nitrate isn't easy in other ways than by RO, so in my mind, the RO water is not just soft, but also nitrate free, which is the main point for me.

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Mats