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Trickle Filters and CO2 Loss

G'day all,

I am setting up a 5x2x2 tank with a sump-based trickle filter system. I
am going to be running an external CO2 reactor with compressed CO2,
powered by a small rio powerhead. 

I have read the article on aquatic concepts regarding co2 loss from
trickle filter systems, and really it has left me wondering. I know that
many participants in the APD use trickle or wet/dry filter systems on
their planted tanks.

My question is this - what methods do you guys use to minimize co2 loss
from the trickle filter systems? I would rather not be re-filling my
cylinder every other month...


Adam Shaw