I am having problems with constantly falling ALK in my pool. I am using a SWG. I am adding acid almost daily at a rate of 16 to 20 ozs per the Pool Calc for the Iphone. I am only dropping my PH to 7.4 from whatever the reading is that day for the PH and ALK. I am currently sitting at 70 and I will probably add 2 lbs of baking soda before I leave town to get the ALK up to 80. Does anybody have any ideas as to what may be causing the ALK to drop? I have a bubbler on the sunshelf but I thought that would only come into play if the PH dropped to around 6.8. My CH is 550.