Yes those were my ipad pics, I don't know how to make them bigger but yes, I agree that the cartridges are not good anymore. We replaced them in 2011, so they are 3 years old and have been through a few swamps. Our PB picked the equipment and then kind of left us to figure it out on our own, he wouldn't answer his phone for questions. So the first year, 2007, I pretty much had to figure it all out on my own. Some things I figured out better than others! We are going to price covers for the fall, in hopes that we could open next year to a clean pool. After I posted my last message I went out and added 4 more jugs of walmart bleach, so the 8.25%. I will test again before the sun comes up and report back. Thanks for your help!