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I have the red sea co2 test kit and i keep running out of co2 B Contains sodium Hydroxide and hate paying $15+ for another kit. Would Sodium Hydroxide Lye work says its for making soap, its cheap 2pounds for $5.
Just in case you don't have the instructions, here is an article written by billionzz.I mite try and make some 4 Dkh they say its pretty easy to make.