Fluval 20g-CO2 Diffuser - 0.7 Ounces

This diffuser works just fine.

This clever design maximizes the CO2's exposure to the water on two surface planes. It's a very simple process but it works effectively. And my aquaforest plants do quite well with it.

I think the previous reviewer didnt quite understand how CO2 and water intermix. Tiny bubbles under pressure are not the only way for water to absorb CO2

I obtain my tank's CO2 from a reactor using simple sugar and yeast. It does not supply the high pressure found in CO2 cannisters, and therefore requires a diffuser like this that doesnt need much pressure. This diffuser is ideal for such CO2 sources. I can easily recommend it.

Given that I purchased this item to replace a real ceramic diffuser that broke on me, once I received this in the mail I quickly learned that this product is an over glamourized cup with a hole in it. The picture and description is misleading and a 29 cents cup would do a better job.

This product does not allow for any water flow to interact with the CO2 that collects in the (upside down) cup so the CO2 levels in the tank are seen to drop after about 2 days of operation.

For the newbees...don't bother, get a real ceramic diffuser and you will enjoy the results better than this clumbersome device.

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It's a cup reversed upside down to hold the gas stuck underwater and overflows to the higher cup once the below one becomes full to double the surface of CO2 interfacing with water.. In face you can even cascade more than two cups as you grow depending on you aquarium height

It is ideal for yeast co2 users as no pressure at all is required while I have a co2 pressurized tank to I use a bubble diffuser at the bottom of the tank while hanging this fluval cup above it near the middle or top of the water to catch the un dissolved bubbles before reaching the surface and get wasted. In face I was quite surprised how much of co2 I can dissolve within couple of hours with this product that in face were getting wasted to the surface

Plants are enjoying ang growing like crazy and for the first time ever I will start trimming my plants soon

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Does not diffuse Co2 as stated. It more likes catches the Co2 and holds it under water until it releases out the sides and gets wasted.

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Bought this to try out for my DIY c02. I tried the ceramic diffuser and the DIY bottles don't produce enough pressure to use it effectively. This is essentially a bulky plastic cup that's upside down. The box claims it's ideal for nano aquariums...FALSE. it looks bulky in even a 10 gallon.

The biggest downside of this plastic cup is the NOISE. once enough co2 is trapped under it will let out a big air bubble and that thing is loud. I'm now currently waiting on a nano glass diffuser i ordered off ebay for 5 dollars

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