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Message: [QUOTE="flboisseau, post: 530973, member: 21942"] I have added some crushed oyster shells, and they may be helping Regarding baking soda, everything talks about hardness, which I realize will rise with that. But I am concerned about upping the PH. For example the site some one pointed me to ask me how much I want to raise the ppm KH change. I do not know that, so the calculator does me no good, I want to raise the PH to above 7. So how do I figure out how much baking soda I need to go from 6.2 to 7? [/QUOTE]