Inline CO2 Diffuser for Planted Aquariums, External Canister Filter Atomizer for Fine Microbubbles and Hidden Hardware

Give a planted aquarium a cleaner view while delivering CO2 through the filter return line. This inline diffuser connects outside the tank to the outflow tubing of an external canister filter, reducing visible equipment inside the aquarium.

Extremely fine CO2 microbubbles support ready absorption by aquatic plants and encourage lush, healthy growth. Choose the diffuser size that matches your filter tubing, or select the corresponding ceramic replacement option.

Key Features

• The inline installation keeps the diffuser outside the planted tank, so less equipment interrupts the aquascape.
• Fine CO2 microbubbles are readily absorbed by aquatic plants, supporting lush and healthy growth.
• The diffuser can be completely disassembled, making routine cleaning and part replacement more manageable.
• M1 and M2 diffuser sizes accommodate two common external filter tubing sizes, allowing a more appropriate fit for the existing setup.
• Replacement ceramic options let aquarium keepers swap in a spare during maintenance, helping maintain a consistent CO2 supply without downtime.
• The diffuser pairs with Dymax aquarium lily pipe options for a coordinated external-filter setup.

Specifications

• M1 fits 12/16 mm (1/2-inch and 13 mm) filter tubing.
• M2 fits 16/22 mm (5/8-inch and 17 mm) filter tubing.
• Available diffuser options: M1 Diffuser and M2 Diffuser.
• Available replacement options: M1 Ceramic Replacement and M2 Ceramic Replacement.
• Minimum working pressure: 30 psi.
• Use pressure-proof tubing only.
• Install on the outflow tubing of an external canister filter.
• For cleaning, soak the diffuser carefully in three parts water and one part bleach.
• Do not scrub or touch the ceramic ring.
• Handle the diffuser gently during installation.

Connect this diffuser only to the canister filter outflow; placing it on the inflow may trap CO2 bubbles in the filter and motor. Weaker tubing may burst under pressure, so use pressure-proof tubing and confirm the correct M1 or M2 fit before installation. Keeping a spare ceramic ring ready makes maintenance easier while preserving the aquarium’s CO2 routine.