Since you said your a "poor grad student" just use the Vodka Sugar Vinegar method minus the vodka. So use 750ml RO water, 3tbsp white sugar and 175ml plain white vinegar. Go slow and gradually increase the dosage. I use this method myself for nitrates and then I use the Foz Down to eliminate the Phosphates.
I will be switching from Rogers white sugar as it is made from GMO Round Up Ready Sugar Beets.
Cheers,
Tim
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