What type of rocks will not affect hardness

1127 Views 6 Replies 6 Participants Last post by Zapins, Jun 13, 2008

duzzy

Discussion Starter · Jun 13, 2008

Hi there,

I was wondering what type/sort of rocks do not affect water hardness. What should I look for?

To test them can I use hydrochloric acid (spirits of salts we call it here) or at least my dad does

Regards darren

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