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Aqueon QuietFlow Canister Filter 400
Model: QuietFlow Canister Filter 400 · US configuration
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A 400 GPH, three-basket external canister with twin polishing-unit plumbing. Aqueon's 2025 catalog lists 100–150 gallons while its current variant page and instructions say up to 155; the finder uses the conservative 100–150 overlap.
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Explore this buying guide ↗Why consider this model?
- The 400 is the largest QuietFlow variant and is the only one whose manual specifies a pair of HOB polishing units joined by the supplied Y-fitting when that return is selected. Its conservative 100–150-gallon screen follows the current catalog while staying inside the older page/manual ceiling.
Tradeoffs to weigh
- The product page and instructions say up to 155 gallons, but the 2025 catalog narrows that to 100–150; this assessment does not claim a numeric match above 150. The body needs 19.875 inches of vertical clearance, basket volume and high-waste suitability are unpublished, and the gravity-fed placement and service rules still apply.
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