Anyone have a DIY method of softening water that really works? No reverse osmosis, a real cheap way to lower PH, GH and KH? Missouri water is full of lime and calcium, I know I will eventually have to buy a RO system, but maybe someone has a method that works. My plants seem to be growing fine, but it is hard to grow some species without using chemicals such as acid buffer. The CO2 content of my water is very low, so I add about three 2 liter bottles of DIY CO2 about every 10 to 12 days. 2 cups sugar and 1 tsp. dry yeast, sealed tight to a 55 gal. tank. Acid buffer seems to lower the KH but the GH lowers very little. I use a tetra test kit for GH and I think the lowest I've ever got it was about 17 drops, but it generally takes 20 to 25 drops to change the color. So just thought I might try a last resort and see if anyone has any solutions.