I have a Hayward filter 3/4 horsepower motor. My shock is poolbrand quick dissolving sodium dichloro triazinitrione. Algaecide 40 pool brand (sams club) dimethyl benzyl ammonium chloride. My tablets are pool brand 3 inch trichloro trianzinetrione. I also put in 2 lbs of cya 3 days ago. Pool store said my readings of cya were ok. I use the strips for testing but will invest in kit you mentioned for these problem times. Hope someone has some ideas. Many thanks.