This is a comment from an actual Aquaripure customer on another forum.
"as for reducing water changes due to nitrates.[aquaripure deniterators] will do the job. all you need to do is water changes to replenish the nutrients in the water and vac the gravel.
i have them on all my tanks and if you git the right size they will work.
all the denitrator needs is fed once a week with vodka or sugar water.
i use vodka it is easier to deal with just take your syringe and shoot it up.
the expense of these are 129$ to 400$ dollars. the one i have on my 240g cost 189$. www.aquaripure.com/
240g 3 O,s 7 silver dollars and a pleco and a pair of brisslenose cats
55g 5 elephant noses 5 bala sharkes and pleco
55g comunity 5 blackskirt tetras 5 red eye tetras
5 zebra danos 5 white cloud 2 apple snailes and pleco."