I downloaded this app and found that I was lacking the msstdfmt.dll to run it. When I would run the dilution program it would crash and give a runtime error 713.

I got the required .dll from dll-files.com and placed it in the system32 directory. After copying the file you have to open a cmd prompt and type "regsvr32 msstdfmt.dll".

Hope this helps anyone with the same issue.

Thanks for the program!

Don't forget to also check out The Pool Calculator which is available on-line, can be saved to be run off-line, and is also available as an iPhone application. It does more than BleachCalc and in some cases is more accurate (the Borates calculations are wrong in BleachCalc).