Fair enough - but there were so many people in another thread that couldn't find that page, it was getting ridiculous...
I guess a person would have to try the tufa and see what becomes of it over time - looks like teevee will be our guinea pig.
I think the arguments against its use put forward by StirCrazy were persuasive enough, even without my bias against less-than-natural materials, even if they are close. I'd hate to be kicking myself in the @ss down the road if I had to dig out my base rock and put something better in.
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Alan
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