Aquarium Filters · owner-verdict comparison

Eheim Classic 2217 vs AquaClear 70 Power Filter: what real owners say

Real owners lean toward the Eheim Classic 2217: 82% of 80 owners recommend it, vs 45% of 22 for the AquaClear 70 Power Filter.

Verdicts aggregated from Reddit, enthusiast forums, and YouTube owner comments — affiliate reviews excluded. Sample sizes differ; judge accordingly. How we score

Eheim Classic 2217

82%of 80 owners recommend

82% recommend · 3% neutral · 15% don't

Owners praise

Lasts for years to decades / built to last
Easy maintenance, backwashes into a bucket
Excellent biological / over-filtration

Owners complain about

Media isn't in easy lift-out baskets
Flow leaves dead spots, may need a powerhead

Full owner report →

AquaClear 70 Power Filter

45%of 22 owners recommend

45% recommend · 41% neutral · 14% don't

Owners praise

Widely regarded as the best hang-on-back filter on the market, with several owners switching from brands like Aqueon and saying they'll never go back
Extremely reliable and long-lasting, with some units still running decades after purchase (one owner still runs an AquaClear 70 from 1990)

Owners complain about

Can be finicky to restart after a power outage or once the impeller gets dirty, sometimes needing repriming or grinding/failing to cycle water at all
Outflow is quite strong out of the box and often needs configuring to tame, with a few owners removing it from planted tanks because it was blasting their plants

Full owner report →

Which should you buy?

Get the Eheim Classic 2217 if

✓Owners of roughly 75-gallon tanks
✓Planted-tank keepers wanting strong biological filtration
✓People who value silent, decades-long reliability
✓Buyers preferring simple, no-frills canister design

Skip it if

Anyone wanting easy-lift media baskets for maintenance
Setups needing high flow without added powerheads

Get the AquaClear 70 Power Filter if

✓Owners who want a customizable media chamber, similar to a canister filter but cheaper
✓Planted or reef HOB setups running refugium media like chaeto, floss, and purigen
✓Aquarists prioritizing reliable long-term mechanical and biological filtration over years of use
✓Tanks needing strong flow and surface agitation, like sponge- or gravel-based freshwater setups

Skip it if

Owners intolerant of occasional repriming or restarting after power interruptions
Delicate planted tanks where strong outflow can damage or uproot plants

What Eheim Classic 2217 owners say

“loving the canister. very quiet”
— @T_Quik on YouTube

“If I had to choose again I'd probably buy two Eheim. Though the Fluval is a bit easier to maintain and it does suck up fish waste better, the noisy impeller and crappy build quality of it has kind of turned me off it.”
— Mun-Mun on Reddit

“My life would be easier and my tanks would look better if I had only bought Fluvals!”
— @shavinmccrotch9435 on YouTube

What AquaClear 70 Power Filter owners say

“I still have an old AquaClear70 from 1990 that I still run”
— TheBlackStache on Reddit

“it works great but the flow is pretty strong”
— DFlyLoveHeart42 on Reddit

“Ran it completely empty, i.e. no filter media or sponge, and it still shut off randomly.”
— ElizzaBum on Reddit

Eheim Classic 2217 vs AquaClear 70 Power Filter: frequently asked questions

Is the Eheim Classic 2217 or the AquaClear 70 Power Filter better?

Real owners lean toward the Eheim Classic 2217: 82% of 80 owners recommend it, vs 45% of 22 for the AquaClear 70 Power Filter.

Who should get the Eheim Classic 2217?

Owners point the Eheim Classic 2217 at owners of roughly 75-gallon tanks, and planted-tank keepers wanting strong biological filtration.

Who should get the AquaClear 70 Power Filter?

Owners point the AquaClear 70 Power Filter at owners who want a customizable media chamber, similar to a canister filter but cheaper, and planted or reef HOB setups running refugium media like chaeto, floss, and purigen.

What do owners complain about?

The most-cited downside of the Eheim Classic 2217 is media isn't in easy lift-out baskets. For the AquaClear 70 Power Filter, it's can be finicky to restart after a power outage or once the impeller gets dirty, sometimes needing repriming or grinding/failing to cycle water at all.