<a href=showthread.php?s=&postid=7259033#post7259033 target=_blank>Originally posted</a> by chindapol
incliao: thanks for your reply, i got one more question for u. Regarding the sulfer bead you're using, are u using a special grade (puritywise) for aquaculture or general sulfer bead that's used in archiculture (cost 2$/liter like in the article stated)?
big thanks!