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I have hooked CO2 up to output of canister filter before. The pain was finding hose fittings to hook up the air tube without water leaks. Hooking up to shower pipe is probably easier.

The price of filling 5lb or 10lb is the same. At my local welding supply store, it is $10 to $15 to fill. Bigger is more cost effective, but note the extra space you need, the extra precaution needed for it to not fall over, and the extra weight which makes moving and transporting harder.
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