ok I downloaded Firefox...save as... then it sent me to download page and the download page is right back here. All I need to know is I am using the Pool Calculator daily and where it says add bleach I am putting in 12% since that is what my chlorine is from my pool store. If thats ok then i will get some bleach I know to be 3% and go from there. I really like the calculator. I find it to be a great tool