Pawfly Clear Acrylic CO2 Diffuser with Bubble Counter

The Pawfly CO2 diffuser (model Pawfly-2082-TP) combines a diffuser, bubble counter and anti-backflow device in one clear body. It is made of PC plastic, uses a replaceable ceramic disc, and mounts with a suction cup. Pawfly designs it for planted tanks 11 to 47 inches long.

Pressure requirement

The diffuser needs a CO2 source with a minimum working pressure of 14 PSI. That suits pressurized cylinders with a regulator. Some low-pressure DIY yeast systems may not push gas through the ceramic disc reliably, so check your setup before buying.

Break-in period

Pawfly asks you to soak the diffuser for 24 hours before first use. At first you may see large bubbles; these become fine within 2-7 days as the disc fully wets. Do not raise the gas rate to compensate during this time.

Using the bubble counter

The counter shows larger bubbles inside the body, which you can count per second. Use it to set and repeat a rate:

• Start low and increase slowly over several days.
• Watch fish at the surface for signs of too much CO2.
• Pair it with a drop checker to see the actual level in the water.

Backflow protection

A built-in anti-reverse device prevents water from siphoning back into the line when the gas is off. An external check valve still adds a second layer of protection for your regulator.

Material

PC resists cracking, fading and deformation better than glass and stays clear, so you can see the counter. Clean it with a soft brush to avoid scratching.

Maintenance

When bubbles grow larger over time, the disc is clogging with biofilm. Because the disc is replaceable, you can swap it rather than replacing the whole unit.

Alternatives

Compare the FZONE acrylic diffuser with bubble counter for a similar all-in-one design.