The biggest problem I have with the G6 is that it only has one chamber for chemical media, so I purchased the TRI-EX cartridge. The picture shows three different media. I assumed the cart would be a three chambered one, but it is not. The three chemical medias are mixed together in one chamber. The downside of all the G-6 chemical cartridges, aside from being pricey, is Fluval's recommendation that they be swapped out every 14 days. The G6 is rated to manage aquariums from 80 160 gallons, so I am assuming the 14 day change is geared towards a reasonably stocked 80 -160 gallon tank. Since mine is a reasonably stocked, heavily planted 50 gallon tank, I have pushed my carts to 21 days. So far the water quality checks out fine. I plan to push to 4 weeks and also experiment with some of my favorite medias to replace the Fluval media when the carts are exhausted. The carts are reusable which is nice. After carefully removing the bottom cap and cleaning them, they can be refilled with fresh media. Naturally, Fluval suggests their media is optimized for the G6. They do not say other media will not work, they prefer you buy their product. All in all, the carts are easy to work with, and the TRI-EX does filter with carbon and media to remove nitrate and phosphate.
These cartridges are essential if you have the Fluval G6 filter however the manufacturer recommends you change them out every couple of weeks! That would run you nearly $600 a year! That's more than the cost of the filter itself! I change them out every 4 1/2 weeks or so and my 50 gallon tank and fish seem to be doing just fine. I've read about other people who keep the cartridge cage and fill it with other product but I haven't tried that yet. Giving 3 stars only due to high price.
Buy Fluval G6 Tri-EX Cartridge Now
Doesn't and isn't recommended for salt water tanks. The nitrate portion just becomes a blow bye! I am sure it works great for fresh water though!
Read Best Reviews of Fluval G6 Tri-EX Cartridge Here
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