Yes, clicking on that link uses our Amazon link where the forum earns a small percentage off each sale. (Even if you don't order pool stuff, any Amazon purchase that starts with that link does so.)

Go back and reread post #4 instead of me retyping the criteria about how high and how long to hold at shock level. Order the kit ASAP so you'll have a better way to test the higher chlorine readings and also CC. (If you are an Amazon prime member, you can get the kit fast. Sometimes they have trial Prime memberships if you aren't sure about it. I'm sure it will tell you on their website. Haven't looked recently.)