Old thread but I put this to work today and I'm already happy. I used the Gatorade bottle DIY. My ph was going down to 7.6 at night and in the day 7.96. Before attaching the soda lime to the skimmer, the ph was going down and was at 7.83. I attached the the bottle filled with SL and within the hour it shot up to 7.91. My controller keeps a log so I will check tomorrow to see all the changes.