on to a side by side comparison of a canister and a HOB. in regards to media volume and flow rate.
i didnt want to break down an fx5 just to pull out media, so i grabbed one of my eheim pro canisters i have lying around. so this will be the base of my comparison.
the canister is an eheim professional 2227 wet/dry canister. (rated for a 90g tank)
the HOB is the good ol aquaclear 110 (rated for 80-100g tanks)
the media in the canister is crushed coral.
the camera. my trusty blackberry storm i was posting from earlier. (i couldnt find the memory card for my camera, so this was my only other option. lol. please excuse the quality)
first, the bio media. the canister has 2 media trays which for our purposes are filled with crushed coral. this allows for maximum use of the media baskets on both the hob and the canister (also, it happens to be what was already in there). for the ease of returning the media to the canister, and for cleanliness, i lined the media basket in the ac110 with a plastic liner.
then opened the canister and pulled out the first basket of media to move it to the HOB. this is my first time actually testing this theory myself. up to this point it was just an educated guess. so im gonna go one at a time to see how much of the media exactly the HOB will hold. im sure it will be a lot considering.
first basket in. the hob is filled about half way. now for the second basket
well whattaya know... canister empty, hob filled. but does the lid fit back on?
indeed it does.
conclusion: the ac110 holds just as much media as a comparable canister rated for the same sized tank. looks like bio filtration is a tie.
how about mechanical filtration?
lets check the flowrate.
the eheim canister is rated at 227gph, while the ac110 is rated at 500gph. ultimately. higher flowrate = better mech filtration. but that could have been expected, as fluval is known for having great mech filtration.
conclusion: the ac110 has more then double the flowrate of the canister. mechanical filtration is a win for the HOB.
so. not only does the hob hold the same volume of media as a canister rated for the same sized tank, it provides better mechanical filtration. sorry buddy, your myth has been busted.
heres a little added bonus.
and now, one of the main deciding factors for most hobbyists. the price. while shopping around, you will probably find better deals on both, but for our comparison i went to theaquariumguys. common shop for online sales, and one that carries both.
eheim canister 312.99
aquaclear hob 89.99
now keep in mind, the canister has other goodies on it that will justify some of the price difference. it is afterall a much more involved piece of equipment, however, for our purposes, even with the advancements in the canister system, the price does not even come close to reflecting the price difference. while the eheim is on the far end of the spectrum, a comparable canister rated for a similar sized tank will still run you between $150 and $200, and will not provide any of the added benefits of the eheim canister, further proving my point.
well that was fun, eh? i hope you all learned something new. i know i did. and in the end, thats what its all about.
old ones were called ac110 after the max tank size. Its 500gph, but the 425gph may be from the minimum gph since you can adjust it abit.I remember my old box saying 425GPH and reading about it in the manual. I always thought they were 500, but looks like the newer ones are 500GPH therefore making me incorrect. Oh well. I think its kinda dumb loading both the filters up with media anyways when I can jus get a canister filter or wet dry. I think both are equally great HOB's and do a great job, but I wanna get away from that scene.
The 50's and below are good filters too but you're obviously not going to use those for medium to large sized piranhas either so I wouldn't say that they blow by any means.I agree i had a 50 and it was kinda useless...I wouldn't go with anything smaller then the 110. the 110 is only 25GPH more then the Emp400, so its really not much more powerful.