I picked up some test strips @ LOWES. These happened to be a very well known brand so I expected some decent support of of them but was SEVERELY dissappointed. They show on their package that you can verify your results and treatement by entering your results on their website.
1st failure - clorox's actual website has no, zero, zip, nada on the test strip product (only cleaning products)
2nd failure - Their pool size calculator does not allow you to enter Spa information
3rd failure - Their application gives ERRONIOUS recommendations based on the information on the strips themselves
As an example, my water showed low pH & low alkalinity yet the website recommended that I add ph DOWN to the spa.
4th FAILURE - The scale is A, B, C, D, E with A at the low end and E at the high end for EVERY variable. When you put the ratings at E for everything the website tells you that "Congratulations, You have PRISTINE water conditions" or some similar incorrect babble.