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What type of rocks will not affect hardness

1126 Views 6 Replies 6 Participants Last post by  Zapins
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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Not too hard. Swimming pool and hardware stores sell it as muriatic acid. Same thing - just be careful with it. Don't use it inside and absolutely don't spill it on your clothes.
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