I have a great naturally high PH of around 8.26. When I dose Soda Ash it will rise to a little over 8.4. I also live in an extremely cold location. 47 below zero is rather common. This winter I will be sealing the windows in an effort to stop the temp swings inside. This will increase the CO2 and therefore lower my PH. I am considering trying to mix both Soda Ash and Sodium Bicarbonate to limit the increase in PH. My problem is what ratio and how much would I dose? For each percentage of SB do I also increase the dosage? IE if I mix 1/3 SB to 2/3 SA, do I dose 1/3 more and go from there?