Quote Originally Posted by hobbyguy View Post
Ok potassium hydroxide but how much do I use if I want to be doing a gallon. Thanks for the reply
You need a scale and to measure in grams to be accurate. If you don't have this, then start with approx 1 tbsp per gallon and work your way up from there.

Unless my calculations are off, 1 tbsp in 1 gal of water is approx 1% by weight.

Start low and work your way up.

Quote Originally Posted by hobbyguy View Post
Oh and why do people use baking soda or say to use baking soda.
Simple, people say this because NaHCO3 (baking soda) is easily to get. The problem with NaHCO3 is the extra CO (carbon monoxide) that is produced under electrolysis. If you use baking soda, you will eventually have NaOH (sodium hydroxide) anyway. Using baking soda will also potentially damage the surface of your electrodes and muddy your water with impurities.

If you cannot find KOH, use NaOH. If you cannot find either one, use Google.