See first review below I used it for 4 months on the 29 gallons, upgraded to 75 gallons and it works just as well as it did 9 months ago when I installed it. I recently ordered a second unit so I can clean the first atomizer and have a continuous CO2 dispersion. fresh water and about 10 times the amount of dechlorinator you would normally use. Rinse well, if it smells like bleach, repeat the process. Original: I use this on a Fluval 406 canister filter. After the first few days the bubbles were bigger than I expected, but on the third day the outlet nozzle was putting out a fine mist like smoke. At about 1.5 bubbles per second, my dripper turns green and the plants in a 29 gallon tank are thriving.
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