API Nitra-Zorb Aquarium Canister Filter Filtration Pouch, Size 6

We had high nitrogen levels in our small 10 gallon aquarium and no amount of water changes helped. I put this in the filter and within hours the levels were perfect. It’s super easy to use also.

I have a 10 gallon cube aquarium that has a sump tank setup. My nitrates are usually in the 20-40ppm range but I wanted them to be lower. When I do my weekly water changes, the nitrates drop to about 10ppm. I used this and it dropped to about 5ppm and kept it there for about three days. I’ve noticed the algae growth has slowed down in my planted tank, which is a bonus when I do my weekly maintenance. The bag is very fine so it’s easy to rinse and holds the particles well.

Used this product in my 30 gallon aquarium and after 2 days the Nitrates dropped to 5.0 ppm from a blood red looking vile or maybe over 100 ppm. It's to early for the final result, but so far great results. I swapped out for a new filter and cleaned the filter chamber and added the bag behind the filter. I believe my problem was from over stocking the tank along with over feeding and infrequent filter changes. I also needed to up the volume of water changes instead of just 5 gallons at a time. I was doing frequent water changes at the 5 gallon volume to bring down the numbers, but no change until I added this product. I'm going to recharge the bag in a few days.

Highly recommend. Fantastic carbonless filtration system for 30-50 gallon tanks!

After 10 days in my aquarium , second recharged already did I have not seen any positive results

After 24 hours in my filter, my ammonia went to 0, and my nitrates were reduced by half. It's easy to recharge, and will definitely buy again in the future. Had to rinse it several times before adding it, so make sure you do too!

The nitrate level has been decreasing since purchasing and using this stuff, but it still doesn't seem to be the best. Not really certain if it's the stuff or something we're doing though.

Our sump system for comet goldfish at work had an ongoing nitrate problem to the point we were losing dozens of fish day. As a last ditch effort after exhausting all other options to save our fish, we tossed a bag of Nitra Zorb into the sump. The next day, the nitrates that had been at nearly 200ppm had HALVED. One recharge later and the nitrate problem is resolved and our comets are thriving. This stuff saved our fish and we'll be keeping a bag on hand for any emergencies later on.

This product works great tank is crystal clear i have to check the numbers and see if it helped my nitrate problem. Fish seem to be swimming around just fine.

I had a nitrate/nitrite problem in my aquarium and this worked quickly without any unexpected side effects. It is important to rinse before using to avoid a cloudy tank. I currently have it recharging in an aquarium salt solution.