I don't know what buffer sprinkle is, but whatever it is, you don't need it. Your alk isn't bad at 70. We usually recommend alk from 80-125 and you are close. If you want to add just a little baking soda, you can. Or try it at 70 and if your ph is stable after you get it where you want it, leave it at 70 for now.

Likewise, I don't know what Algon is. You don't need it either.

Your calcium is fine. Your chlorine needs to stay between 3-6 with a cya reading of 40 which, by the way, is a good level. In your pool, each quart of plain, unscented 6% laundry bleach will raise your cl by about 1 ppm. CC reading of 0 is what you want.

The ph is too high at 9.0. You do want it between 7.2-7.8 with 7.4-7.6 being ideal. Add some muriatic acid carefully in front of your return jet. Maybe start with a cup. Wait several hours before retesting and redosing if needed. Better to do it in small doses rather than trying to hit it in one shot. Be careful not to get it on you or on your liner and don't breathe the fumes. Hope this helps.