Hi, Im a long time user of Pool Math on my laptop. Is the laptop version no longer available? I have downloaded the APP to my iPhone, and registered with sign in and password. I can't figure out how to accurately add in ph numbers. I can't seem to put in 7.8 only 7. Same thing for FC. I also liked being able to change values to see what an addition does to the overall CSI. I would like to see how to work with the app before signing up for the subscription. It's an ease of use thing for me, I am comfortable with the desktop and hopefully will figure out the APP. Any advice is appreciated.