Can you dose CO2 into a filter for ultimate absorbtion?

Discussion in 'Carbon Dioxide (CO2)' started by Animal Mother, 27 Oct 2009.

  1. Animal Mother

    Animal Mother Member

    I'll be running two external filters in my new setup, a Fluval 405 and a 205.

    I was wondering wether it would be good to diffuse CO2 into the inlet of the 205 (my secondary filter) to try and get 100% absorbtion of the CO2.

    The affect on the cultures in the filter doesn't bother me as I'll have my 405 to handle the majority of filtration.

    Cheers. ;)
  2. James Marshall

    James Marshall Member

    Adding the CO2 to the filter inlet does ensure good absorbtion and It does not seem to affect filter bacteria.
    However the effect of the CO2 on the impellor and filter's seals can be very detrimental, and some filter manufacturers do not garantee their products under these conditions.

  3. Animal Mother

    Animal Mother Member

  4. Voo

    Voo Member

    You might also get a build-up of undissolved CO2 which gets expelled occasionally. It's no necessarily bad, but can be noisy. A bit like the air coming out when you prime the filter.
  5. Animal Mother

    Animal Mother Member

    Thanks for the heads up. :thumbup:

    Seeing as CO2 has no detrimental effect on bacterial colonies, shall I dose BOTH external filters then so that I get CO2 rich water flowing over both sides of the tank?

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