Why are Canisters More Money than HOB?

[Bderick67]

a larger tank with larger/more waste producing stock needs more than HOB's can supply. I love AC110's but they just wouldn't take care of stock levels that people like us prefer on larger tanks. This being said though, i think they're a great addition to mid-sized tanks for water movement.

IMO

As I would agree with you here. It seems though it also would boil down to ones perception as to what exactly a larger tank is and what waste "Monster" type stock actually produce. The again I guess wisdom is only gained through actually have experience in the matter.

Myself I use HOB on my smaller tanks 75g and below. A combination of both on my mid-range tanks (120-180g) and I wouldn't even bother putting a HOB on my 450g

BTW my tanks are crystal clear, none of the minimal filtration BS going on here

 

[Bderick67]

Two approaches to filtration are:
Move the water slowly through a lot of media, allowing a long contact time for biological action to take place. This is how Eheim Classic and many other canister's work.

Move the water quickly through a small amount of media, repeat as many times as necessary to achieve desired water quality. This is how most HOB's work.

The only canister I actually have experience with are Eheim 2213, which is rated to flow just a little over 100 gph, or about the same as the smallest Penguin or Whisper HOB.
However, it can handle a tank MUCH larger than those because it holds much more media. The 2213 is rated for tanks up to 66 gallons, and people frequently use them for tanks in the 20-30 gallon range, which would be impossible with the smallest Penguin or Whisper.

There is a great deal more material in a canister, and it has sealing surfaces which must be water-tight under a small positive pressure. Most HOB's have few sealing surfaces below water level, so don't have to be as water-tight (the seal around the motor is an exception on some).

Good point Ron, not sure why others think you are misleading anyone. It is obvious by reading your first sentence that your a talking about the "Bio filtration" designs of each of the specific type filters you mentioned.

I could see it being different is you actually had mentioned "mech filtration" but that what happen when people assume

 

[Darth Scohin]

Wow, Great posts I think I'm really understanding what the difference is here....I Prefer 90% of Hagens Stuff I.E. AC and Fluval....I'm wondering very quickly would 2 AC110+a 55gal Sump be adequete for a 180gal or would the AC110 be worthless with the sump?

 

[Morcs]

I think 2 ACs with a sump would work well.

Use the ACs for mech filtration and water turnover / surface agitation / movement. Theyll hopefully pickup most of the crud in the water, and the sump would be your bio.

I run 2 AC110s on my 65g. Changed from a canister and am quite happy at current. Though will change back to a canister once I can afford a really good one (like an eheim 2078)

 

[Noto]

Canisters cost more because people will pay more for them. Economics 101.