Just wanted to share this with every one. Converted over to chlorine this year from bacquicil, any one whose has done it knows you go thru a lot of chlorine and a lot of testing. I found this app on google, it's called "Pool Pal". It's free and the author tied it in with readings from here at Troublefree pool.
I don't want to take away anything from the work that went into formulating the 'Pool Math" calculator on this site. That one works great. It's just that I'm a gadget freak and just love this thing
Looks like someone else mentioned this app. Oh well!