A few tons? Ouch... Why so much? If I'm thinking about this right I just want the PH to come up between 7 & 8, Hardness to around 50 and my Alkalinity to 60-80 right? Being that I'm not too far off, I was assuming that a few hundred pounds would be enough. From what I have read it looks like you can never add too much as ph maximizes at 8.4, but I also don't want to waste it.