So I set the DOS to dose 1000mls when the ph is below 8, and it works great. The PH didn't go below eight all night, and the ALK went up to 8.85DKH, which is fine with me. I was thinking about possibly going back to Kalk, but now, I don't think so. I made a total of three gallons today. I want to see how long that lasts me. I think it had to dose a lot last night since the PH was so low. I am curious to see what it will require when it does not have to play catchup.So I mixed up a gallon of this last night (he's not joking when he says it gets hot). It does have a big impact on PH even with just a small amount. For example, I put in fifty mils and it raised the tank PH by .6. The problem with my ph is so depressed it would require hundreds of Mls a day just to keep the PH above 8.