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Message: [QUOTE="Waterbug, post: 115200, member: 2322"] I'm not sure if there is any benefit to plants, but I don't think there's any harm. Optimal is one thing, practical is another. For example, there are lots of chemicals that can be used to buffer water at all kinds of different levels. What I've outlined is common in ponds, when done. Most pond owners do no buffering or testing. They can be fine for years, maybe forever given the right source water. What I don't know is the effect on amphibians. I'm no expert on ponds and less so on amphibians. My assumption is stable pH would be good for them and all these chemicals, at these levels, are in many bodies of freshwater water in the northern hemisphere. I think when you get into tropical fish there are some issues. But now I'm even more over my head. [/QUOTE]