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what i do is i put 520ml of gamma-butylolactone in a pyrex dish heat it, add NaOH ad about 1/2 cup of distilled water let it react then let it simmer a for about 30 min just under boiling point, let it cool down, then i add 1 1/2 amount of disstilled water (260ml), and i do fillter it through a brita water filter. I used to just use plain unreacted charcol and filter it through a coffe filter but i found the brita filter to be a lot easier. The only thing i can think of is that i might not have added enough NaOH, could that be the problem? is their any way i can still add it even though i already mixed everything?