[GBlist] cistern and harmful additives in concrete

[Sacie H Lambertson <dlambert@grasshoppernet.com>]

Can someone tell me if it is harmful to put an air entrainment (sp?)
product in the concrete mix for a potable water cistern?  Sacie Lambertson
	Any comments on Ralph's thought that adding a waterproofing additive is
rather useless since the cistern is going to crack anyway?  Frankly, the
idea of getting down every few years into a couple of large concrete tanks
that are only 5 feet tall to seal with Thoroseal, is most unappealing. 

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