CO2 injection and sponge filter?

Subhro

Member
Hi,
I need help regarding a very basic question. Do I need to turn off the sponge filter when I am turning on the CO2 cylinder? Thanks.
 

Chanyi

Member
Ideally you want to run a canister or hang on back filter when running CO2 to avoid excessive CO2 off-gassing. that a sponge filter would allow.
 

jaydivingboard

Member
Chanyi said:
Ideally you want to run a canister or hang on back filter when running CO2 to avoid excessive CO2 off-gassing. that a sponge filter would allow.
Not my thread but I still learned something, do airstones create the same off-gassing problem as well?
 

Chanyi

Member
jaydivingboard said:
Not my thread but I still learned something, do airstones create the same off-gassing problem as well?
Yes, running increased surface agitation of any kind will "force" CO2 levels back to natural, equilibrium levels (~3ppm).

You can reduce this by increasing the amount of CO2 being dissolved, but it's much easier to control and maintain consistent CO2 levels in a tank using a canister / hang on back filter.
 

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