Aqua-Tech 20-40 Power Filter

The Aqua-Tech 20-40 is a hang-on-back power filter. The OEM cartridge table lists it with the EZ-Change #3.

Hang-on-backAqua-Tech Power Filters20-40 US galStatus unknown

Manufacturer: Aqua-Tech
Model: 20-40

OEM-listed replacements

Listed by Aqua-Tech itself, or by another document published by the filter's manufacturer.

OEM-listed replacementCartridge

Aqua-Tech EZ-Change #3

Product maker: Aqua-Tech

The replacement cartridge carries two of the filter's three stages: the blue polyfiber pad (mechanical) and the activated carbon (chemical). The biological stage is the BIO-Fiber supplied with the filter itself, not the cartridge; the manufacturer states it should never be cleaned or thrown away.

Also documented for: Aqua-Tech 30-60 Power Filter

OEM support pageSpectrum Brands, Inc. (Aqua-Tech)

“20-40 AQUA-Tech ® 20-40 EZ-Change TM #3”

Sourceretrieved 2026-10-05

Third-party compatibility claims

Products that a seller or third-party maker states are for this filter. These are claims by the seller — not OEM endorsements, and not tested here.

No third-party compatibility claim was recorded for this model.

What is not known

Recorded as unknown rather than guessed.

part_numberThe OEM page gives the cartridge name but no part number.