Well I've really never been able to keep Nitrate levels in check.
Even w/ large (50%) water changes they go up past any considered good level.
In a very short time.. like overnight.
Tank can be strangled in plants and even a low bioload of fish and they are still high..
Hopefully technology to the rescue..
Now regarding the G3 cartrage:
The Fluval G3 Nitrate Cartridge is for use with the Fluval G3 advanced filter and will remove up to 13000 milligrams of nitrate ion in fresh water aquariums. Nitrate concentration should not exceed 20 mg/L in freshwater aquariums. Planted aquariums require approximately 5 mg/L of nitrate as a source of nitrogen for healthy plant growth. Nitrate is irreversibly trapped and bound and will not leach back into the water. The continuous use of the G3 Nitrate cartridge in aquariums with persistent nitrate problems is an effective solution against nitrate accumulation. If used as a quick solution to reduce elevated nitrate concentrations the cartridge can be removed once levels have normalized and then stored until required.
Well being too cheap to just buy a G3 and not really needing one at this point my thought was to "build" a Nitrate exchange system that one could just plug in every once in awhile, run for a day or 2 and be done w/ it.
Would cut down, though not eliminate, water changes.
So bought a Fluval Nitrate cation exchange cart and proceeded to ponder what the heck to do w/ it.
Was hoping it had a center hole so as to introduce water to the center and push (or pull) it out sideways.
Not how it's designed..
Anyways a few easy PVC "tanks" were envisioned (maybe even an old RO type tank would work.
Next came pondering pumps and flow rates ect
how fast past the resin ect.
Well being really the impatient sort decided to just use my noisy Eheim 2213.
Put the cart top down (bottom is solid, top is a ring of slots) and surrounded it by 1/2 fill of bioballs.
Probably would have preferred a restriction ring around a right side up cart.. but no patience.
Pump feeds from the bottom and hopefully the bioball restriction will help the water flow mostly through the cart..
Cart fit good in the 2213 basket w/ little up/down slop.
OK not the most efficient way of moving water correctly through the cart.. but we will see.
Only planning on a few hours of running.. max 10 mostly due to the hum of the 2213.. Never did solve that one.
1/2 hr and already problems.
Eheim started leaking at the outlet hose.. Oddly past everything but the grey lock ring.
Thought it was just old end on the hose so cut it back.
Still leaked. No cracks ect in the outlet barb that I can see.
Backed off the lock nut to see if I could tell where it was coming from. Stopped leaking.
Never had that before and the unit, except for noise was put away fully working..
anyways in a bucket and away it goes. Tightened the grey lock nut till I felt pressure.. no more than that.
Was ready to abandon the timeframe (couldn't be here the whole time)
If I can conclusively drop nitrates some in this time frame I'll be happy.
wish me luck.