I have a newly re-plastered pool. I add 4.5 lbs or 72 ozs of CYA. The pool calculator with my given pool size shows that an addition of 68 oz required to bring CYA to 30ppm. I test CYA with Taylor kit and get something considerably under 30. Completely filling the vile past the 30 mark... or something less than 30, the dot is still very visible. HMMMM.... Thoughts appreciated.