I have a 27 foot round , 4.5 deep, vinyl lined pool. We use a sand filter. Brand new water added today when new liner installed. I am not sure what to do first! Tested my chlorine and , of course, it is 0. CYA is 0. And it looks like my pH is 7.2 I bought the TF-100 kit , per your suggestion, and that is what I will be using. Not sure if I have to add stabilizer first or bleach?? I have bleach on hand and also some trichlor 3 inch tabs which I can put in a floater. Any advice on the order of adding ingredients would be much appreciated!! Also am prepared with some 20 mule borax and baking soda to adjust pH and alkalinity. Thanks, Judy from CT!