I use a 20 oz tank - it covers 15-20 gassings in a 15 qt tub. The little cartridges will not work with your remote line. There are ways to use the little cartridges but it is not humane because it releases all the gas at once, the rats know, freak out, and suffer (conscious). With the tank and remote line, you actually slow leak the gas until they pass out, then crank it up while they are asleep (no suffering).
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