KH (Carbonate Hardness) & GH (General Hardness)

[Jimbo205]

My tap water has a pH of 7.4 (Blue), my Carbonate Hardness in dKH is 9-10 with 161-179 ppm and my General Hardness in dGH is 20 with 358 ppm.
I have aquarium plants in my 10 gallon tank.
When I add the Acid Buffer to my 1 gallon container of tap water during a water change - how much should I add?
Which does the Acid Buffer affect besides the pH - the Carbonate Hardness or the General Hardness?
Do I need any other Seachem product to affect the Hardness for my aquarium plants and Mollies?

Thank you for your help.

[Tech Support CH]

The amount of Acid Buffer added depends on where you want your pH to be and your current CO2 and KH level. PH is affected by two things: carbonate hardness (KH) and CO2 level. The higher your CO2 level the lower your pH. The higher your KH the higher your pH.

Acid Buffer changes some of your carbonate hardness into CO2. The CO2 will gas off after a day or so but your KH will still be lower. So your pH will be lower.