Natural pH balance

[1309mw]

can someone either tell me or point me to a previous post of what is considered the best way to raise the pH in water. By nature i have very soft water (68) which causes the pH to be low (6.5 - 6.7). I am looking for a non-chemical way of keeping the pH at a steady 7 even after water changes with new soft water.
thanks.

 

[Lupin]

What fish do you have?
Water change schedule?
Thickness of substrate?
Is this tank planted?
Hardness levels?

You can try crushed corals. Aim for hardness of 150 ppm and over. You can use calcium chloride or baking soda but crushed corals are easier.