Hello, I, too, have found tech modifications to be frustrating . Such is likely because I did not come up in that era. I have hung with the old math page for that reason. This pool's opening, the old page did not give me the answers that my experience told me I should be seeing. Figured reluctantly, it was time to integrate the App. The App held the correct answers. I was challenged with the basic entry ( not kidding, could not even find the decimal so I could enter my ph.) It was not hi-lited. Found it finally. My desire to edit entries on recommended amounts was awkward. The App. wanted me to click done...Seldom done on first pass...I never enter the full recommendations when my ph/Alk is high or low . Guess that means by their measure I am not finished. This appears to be a matter of am I done or not, lol. Well, dispensing chemicals into my pool is best done with restraint, especially when the ph and All are at high or low ends. I take a conservative approach to most details. I have not tried to work the Log functions. Do not know if I will. I love paper. Good luck. All I can say is that the guidance from this site has been beyond amazing. They have fixed my pool when the locals tried to clog it up. Feed your concerns forward. They will listen. Lucky Lyn