North American Fruit Explorers mailing list at ibiblio

[martha_davis@highstream.net]

Clay, loam, sand are particle sizes and have little to do with mineral 
content. 
Not all sands are silica based. Yes silica is slightly soluable in water. In 
my
area it isn't lime that plates out in the toilet, it is silica.  Like with
anything else check your local conditions.

Martha