*	Carbon dioxide reaction chamber includes an adjustable 65 gph flow pump
*	Compact, submersible design includes necessary silicon tubing and check valve
*	Easily connects to any CO₂ regulator and carbon dioxide source for plant health

Powerful carbon dioxide reaction chamber dissolves 99.5% of CO₂ for strong, lush aquarium plants. Features a 65 gph adjustable flow pump that creates a vortex inside the reaction chamber for total dissolution at up to 180 bubbles per minute. Includes check valve and three feet of silicon CO₂ tubing. Easily connects to any CO₂ regulator and source*. For planted aquariums up to 125 gallons. Measures 1-5/8" wide x 3-3/4" long x 2-1/4" high.

Includes: Check Valve and 3 ft of Silicon CO₂ Tubing.

*NOTE: Requires a CO₂ Regulator (sold separately) and CO₂ Source (purchase locally).

Please click on "More Information" for use, assembly, maintenance instructions, troubleshooting, and product specifications.

Use Instructions
Aquarium plants need carbon dioxide to flourish and grow. In fact, this simple gas is an essential component of photosynthesis. However, water movement and filtration in most aquariums cause carbon dioxide to be eliminated through the water's surface. An absence of carbon dioxide can cause your aquarium plants to lose strength, color, or worse. Adding carbon dioxide to your aquarium system during daylight hours can help keep your aquarium plants healthy and strong - without any effect to your other aquarium inhabitants, provided you do not overload the system. This reactor features a vortex chamber that effectively dissolves 99.5% of carbon dioxide at rates up to 180 bubbles per minute.

Assembly Instructions

Rotate the Flow Valve on top of the Reactor to set the flow rate on the pump to the minimum level.
Immerse the Reactor in your aquarium and invert the system to permit the escape of any trapped air.
Using the Suction Cup provided, attach the Reactor to your aquarium's back wall or side.
NOTE: There is no depth requirement for the Reactor chamber, since the CO₂ is fully dissolved inside the reaction chamber.
Connect the Check Valve to the Reactor Inline Tube.
Connect the Inline Tube to a CO₂ Regulator and CO₂ Source (both not included).

Maintenance Instructions
Periodically, algae may build up in the Reactor chamber. To clean the chamber, remove it from the pump housing by gently, but firmly, pulling each component away from the other. Rinse clean with aquarium-safe water. Reassemble.

Troubleshooting
Problem	Solution
Water is flowing up the CO₂ inlet tube	Install the Check Valve inline before the Reactor
Reactor discharges a steady stream of large bubbles	Reduce Bubble Flow Rate; Clean Reactor
System works, but CO₂ in aquarium is not rising	Check for excess CO₂ loss in aquarium*
System works but my plants aren't doing better	CO₂ is only one component of the process. Plants also need suitable lighting, substrate, and fertilization.

* CO₂ loss: Turbulence at the water's surface causes CO₂ to be lost from your aquarium into the atmosphere. Turbulence is caused by hang on filters, spray bar diffusers, air stones, bubble curtains, and other water aeration devices. If you are using an external filter, such as a canister filter, ensure the return/outlet is positioned far enough below the water's surface to prevent water surface turbulence.

Product Specifications
CO₂ Reactor 500 is made of a powerful adjustable flow pump and precision reactor chamber with a high-impact plastic housing. Submersible design connects to any CO₂ regulator and dissolves up to 180 bubbles per minute at 99.5% dissolution. Pump easily adjusts up to 65 gph. For planted aquariums up to 125 gallons. Measures 1-5/8" wide x 3-3/4" long x 2-1/4" high.

Powerful vortex reaction chamber dissolves 99.5% of CO₂

1-5/8" x 3-3/4" x 2-1/4" high; up to 125 gallons, CD-27337, $38.99

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CO2 Reactor 500 1-5/8" x 3-3/4" x 2-1/4" high; up to 125 gallons 3.3 5 4 4

About 90% dissolved About 90% bubbles dissolved at 2-3 bubbles per second. The tornado chamber is just a little too shallow as the odd bubble escapes before dissolving. But, 90% is still an A- in my book. A taller chamber would be more effective but then it wouldn't fit so perfectly in the corner of your tank. July 8, 2011

Reactor 500 does a fine job. Reactor does a good job. Plants really thrive with the co2. I have a 75 gal tank. I purchased 3 val plants and now have 20 plus and more coming. Other plants doing well also. Bearing in reactor will make loud noise and sometimes you can get it to quite other wise reactor needs to be replaced. Reactor usually lasts for 2-3yrs. Doesn't dissolve CO2 at more than 60 bubbles per min.Foster and Smith has the best price. October 9, 2012

Good, but not durable This unit works very well at diffusing CO2, no doubt about that. My issues were in the design. First, the power cord comes out the bottom of the unit, making it very prone to flipping and tilting if the little rubber suction cups aren't properly stuck to the glass. Which leads to the other problem. The little suction cups are VERY little, get very brittle and lose their suction ability in a short period of time. Once that happens, the unit flips and tips and becomes far less efficient at dissolving gasses. I would recommend this unit, but only if you can find and keep a good supply of the cups. November 4, 2011

Poor mounting ruins a good product This worked great... for a few hours and then the 4 tiny suction cups holding this fairly heavy device to the aquarium give up and you find it floating. When stable it does an excellent job of swirling the co2 into the water but it just won't stick. No matter how much I cleaned the glass, moved it around it still would not stay on the glass. I finally gave up and returned it. The suction cups are just too small and too weak to hold it. February 15, 2012