Red Sea CO2 System 500 (Standard Bottles) - Refillable

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This item has been discontinued.

Red Sea

Professional CO2 system for aquariums up to 500 liters-Refillable version (CO2 bottle not included). System includes: Pressure regulator, high precision hang on the tank flow valve, CO2 reactor 500, CO2 real time indicator, bubble counter with integrated one way valve.

Manufacturer Info

With a dedicated team of scientists and other professionals, Red Sea is widely recognized as a leading innovator and manufacturer of quality products for aquarium hobbyists. Red Sea constantly strives to provide hobbyists of all levels with highly effective solution-driven products designed to make your fish-keeping experience as enjoyable and successful as possible.

The embodiment of Red Sea’s dedication to providing solutions for today’s reef-keepers is its range of MAX-NANO, MAX-E & MAX-S aquariums- The only choice for true Plug & Play™ coral reef aquariums, now featuring the very latest in LED lighting technology.

For advanced reef-keepers the Red Sea REEFER provides a great platform into which you can add your own selection of hardware. With its ultra-clear glass, ATO built-in, silent flow valve and superb quality of finish the REEFER sets the standard for those wishing to customize. REEFER is also available as a Deluxe version with LED lighting included.

Red Sea’s unique Reef Care Program (RCP) provides a comprehensive, safe and easy to use program for testing and supplementing within reef aquaria, and is perfectly complemented by Red Sea’s Coral Pro & Red Sea Salt’s, which has become the salt of choice for those seeking the very highest quality water quality for their coral reef aquariums. Both salts are made using a unique natural process which delivers unrivalled homogeneity and is perfect for delicate corals. Check your individual bucket of salt’s composition using Red Sea’s innovative new “MyBatch” software.

Whatever your aquatic needs, Red Sea delivers high quality innovative, solution based products.

Slightly Disappointed from


Experience Level: Intermediate

Not so much

The ease of having everything in one kit is a big bonus, but each component must be durable and these are not. The bubble counter seemed very cheap and stopped working reliably within two weeks. The needle valve is also hard to operate and does not provide a great range of input for CO2. In the end, I purchased a Dennerle bubble counter and the system has been running smoothly since, but next time I will purchase separate components.

5 out of 5 found this review helpful

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Experience Level: Intermediate

Looks are deceiving.

When receiving the set, all the plastic made the unit seem cheap. However, installation was intuitive and easy. About 45min. total setup time. The regulator and the needlevalve seemed more for looks than functionality but they proved to be both very accurate and easy to configure to the required parameters. The needle valve turns with the tubing, which allows very little turning capacity before the tubing begins to play a force on the assembly. However, the needle valve's usable range is very small making this issue irrelevant. It takes a little fiddling to find the right dosing rate, but once found, it stay there. Also, as noted, the calibration range is at most a 1/4 turn between maximum and minimum dosing. The difuser is again very small and it does not look like much until you put it to work. It is rated for tanks up to 500 liters. This can be misleading. I have a 500 liter tank (effective) give or take and it can barely keep a level 10ppm concentration during the day. I am running tests (raising the level to 20-25ppm at night) to see if it can hold this concentration durig the day. If not, I am evaluating a second CO2 difuser. In all it is a great product. One less star for imprecise advertising regarding the diffusers capacity. However, if I do get a second diffuser, it will be the same red sea unit with the same bubble counter and needle valve.

7 out of 8 found this review helpful

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