What type of rocks will not affect hardness

1129 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

Save

1 - 1 of 7 Posts

hoppycalif

· #4 · Jun 13, 2008

Granite is always good. Most rocks with lots of holes in them are not good, with the exception of lava rocks. I don't recall a black rock that wasn't good.

Save

1 - 1 of 7 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.