Originally Posted by spsman

there is a chemical lab located near aljunied estate. dunno the exact address. they conduct all sorts of tests. but mainly focus on biological tests. their equipment is very accurate. in fact i got the info from them regarding po4 and impurities in newater.
what impurities, i dare not conclude becos i did not test it myself. i never conclude on things i dun do myself becos it is not ethical at all.
moreover i am not a chemist to start with.