"Izuan Wahab" wrote in message
...
How long does a bottle last? What is the dosage recomanded for a 55G tank?


A yeast bottle lasts a couple weeks. IME, a 55 gallon is too large to be
significantly affected by DIY CO2. All I was able to do was lower my PH
about .01, and no noticeable CO2 increase, according to Chuck's calculator.