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Mr. PA Knowitall

Just three questions, should be easy for you PA guru's.

1. Can plastic, ceramic or wood air diffuser be used to
diffuse CO2 using a low pressure CO2 system? 
(CO2 tank>>Regulator>>Needle Valve>>one way valve>>plastic,ceramic or wood 
diffuser) Why not?

2. Does adding CO2 to the intake of a canister or power
filter harm it's biological filtering capacity, by overdosing it with CO2?

3. Does an open packet of yeast need to be refrigerated, and how long will it 
stay fresh in or out of the frig?

Any help is much appreciated.

Happy Holidays