water hardeness question

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will74

AC Members
Mar 4, 2007
262
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50
Kentucky
What is a surefire way to achieve a constant low dh and low kh and in turn a low ph? What can I add to my filter to help with this? I have heard to put crushed coral but won't that raise the ph,kh,dh, because of the calcium carbonate to high levels [above 8]?
 
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