Teapot I'm confused by your post. Polyquat is the only algicide this site recommends and is why I used it. I have been doing this method since 2011 and I'm not "pool store" at all. I read many threads on here that recommended the use of it for the problem I was experiencing -cloudy but blue, which it did clear up. I am also aware that it increases chlorine demand for a little while. In the past, it has only needed it for about 2 days and I added it a week ago.
As for the oto test, maybe I don't understand or am missing something. What would be the point to using it? How does it tell me what my CC is? It will turn bright yellow and tell me I have at least 5 ppm when I already know exactly what it is from the FC test I have been using.