Seachem Glass Bubble Counting Diffuser 17 mm

• Monitor rate of CO₂ injection.
• For aquariums up to 75 L (20 US gallons).
• Low profile design excellent for minimizing the visibility of the diffuser.
• Simple and easy to use.

The Bubble Counting Diffuser is a pollen style CO₂ diffuser that connects to CO₂ injection systems to easily disperse CO₂ gas into the planted aquarium. The built-in bubble counter allows for easy monitoring of the rate of CO₂ injection. The inclusion of a bubble counter in the diffuser makes the use of a bubble counter on the CO₂ tank or in-line unnecessary. The Bubble Counting Diffuser has a 17 mm disc.

Compatible with 6 mm (1/4″) – Standard Airline Tubing. Suction cup included.

Specifications

What it is. A pollen-style glass CO2 diffuser with a built-in bubble counter chamber, so the injection rate is visible at the diffuser itself rather than needing a separate inline or in-tank bubble counter.

Seachem’s own spec. 17 mm diffuser disc; fits standard 6 mm (1/4″) airline tubing; ships with a suction cup mount.

Setup & Use

Mount low in the tank using the suction cup, per Seachem’s own placement guidance.

Handle it by the suction cup, not the glass, when removing or repositioning: Seachem is specific about this, since pulling on the glass body risks cracking it.

Starting rate. Seachem’s own suggestion: begin around 1 to 2 bubbles per second and adjust from there against your tank’s CO2 uptake.

Dial it in against a drop checker, not bubble count alone. Seachem recommends pairing this with their own Glass pH/CO2 Checker: raise the bubble rate until the checker’s indicator solution holds green.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number, or email us if you would rather, and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 48 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.