The PH battle

[stinkyattic]

1/2 liter of PH down lasts about as long as a gal. of PH up for me. I also notice that it takes much more PH up to raise ph than it does PH down to lower it. .

Yeah and this is because pH up is (I believe) Potassium hydroxide, KOH, and pH down is Phosphoric acid, H3PO4- a tri-protic acid, and VERY strong.
The active components in each are the -OH group and the -H respectively.