this is currently on ebay and was wondering if anyone has heard of or used them.
SYSTEMS AQUARIUM FISH TANK 9 WATTS 620ml / 10 HR 80-260 LT CONTROL NEW A-192
SYSTEMS A-192 THE CO2
SYSTEM WORKS BY CONVERTING WATER WITHIN THE AQUARIUM INTO HYDROGEN AND OXYGEN BY A PROCESS KNOWN AS ELECTROLYSIS. THE HYDROGEN RISES UP AND THE OXYGEN COMBINES WITH THE CARBON OF THE CARBON PLATE IN THE ELECTRODE UNIT,FORMING CARBON DIOXIDE. THE CARBON DIOXIDE THEN SUBSEQUENTLY DISSOLVES IN THE AQUARIUM WATER.