Ph+ and - please!

On pool doctor it was really easier to understand what to add… now it is too technical… asking me to add muriatic acid, carbonate sodium… no idea what it is as here, in france , it’s only indicated ph+ or ph- on the box…
Can you guide me ?
Thanks !

Ph down is usually dry acid Sodium Bisulphate or Liquid Muriatic Acid.

Buffer /ph increaser is sodium bicarbonate

Ph up is Soda Ash /Sodium Carbonate

Just check the ingredients label on your usual products as every country has different labelling.

Check this thread out too