Carbon Filtration

[Porpoise Hork]

I was looking into getting a gfo/carbon reactor filter units and of course anything with "aquarium" or "reef" attached comes with a 20% price markup. I don't really have much desire to run GFO and would only be using carbon in it. I just can't see spending 60+ on a plastic housing, and I had a thought, why not one of those whole house carbon filter canisters. These things are only like $30 and I can easily plumb it in to my system off the manifold. What's stopping me from using the standard drop in carbon filters made for them, instead of using an aquarium unit.

This unit or something like it is what I was thinking about using.
https://www.amazon.com/DuPont-WFPF1...&qid=1532978360&sr=8-7&keywords=dupont+filter

And with this or similar carbon only filter cartridge,
https://www.amazon.com/Filtrete-Sta...ete+Standard+Capacity+Whole+House+Carbon+Wrap

These filters are rated for 15K gallons and max flow through it would be at best 200gpd. With that kind of flow rate one cartridge on a 75g should last at lease a month before needing a replacement.

Has anyone done this or is there something keeping this type of setup from being used?

 

[DesertReefT4r]

Would not be ideal. Would plug with waste and micro fauna pretty fast.

 

[Porpoise Hork]

Hmm. I wasn't too worried about the waste as it's coming off the return side manifold, but the micro fauna could present an issue.