I agree with Dai. My hydro guy ( who IS an expert btw) says unless you can get the numbers up to 1500 and beyond (which requires a sealed room I believe) you can play with your seltzer and baking soda etc etc etc all you want and it won't make much difference.

Dai...thanks, we needed that. It never ceases to amaze me how many people not only think....but EXPECT the rest of the world to immediately hop-to when they have an issue.....but can't be bothered to do the work themselves.