[quote:70cf461c8e]The only NaOH-only product I've found here is Roebic's Pro Strength Drain Opener. I tried looking for a powdered product in several stores, but none had any that were pure. Anyone know how to substitute this liquid NaOH for the powder?[/quote:70cf461c8e]    Roedic makes a powdered NaOH.  Look for a cylindrical plastic bottle with a yellow label that says "Crystal Drain Opener."