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Re: [APD] CO2 and trickle filters

Tom wrote:
 Here is a very simple idea.
  Seal the wet/dry tower, if no CO2/O2 can exchange from the outside, then
it will not degas.

  O2 comes into the the section and is consumed by bacteria NH4=> NO2=> NO3.
  These bacteria need a fair amount of O2, There's plenty in the water.
  If you want to get rid of excess CO2, then an air vent helps, if not, then
seal the vents.
  Otherwise the CO2/O2 get dissolved into the water.
  Several folks added CO2 to thr wet/dry chamber, It acts like a giant CO2
reactor when SEALED. If not, it'll degas.The bacteria make up for the
losses, it does not matter if you remove the bioballs, you'll have more
bacteria if you leave them in.

I understand what you are saying, Tom. But how can you entirely "seal" a
wet/dry? Water has to enter a from the pre filter, and the pre filter hoses
on a trickle filter are gravity fed and always have air in them, lots of it.
There is no way to keep air from entering and exiting from it that I can
see. The lids over wet/dry drip plates are not sealed. They are only there
to prevent splashing. You'd need a bunch of silicone around it to seal that
area. Many wet/drys are not covered in the reservoir area, and the only way
to completely seal them would be to silicone the lid shut that and seal up
any possible air entry. If you do this then you make it impractical to
service anything inside the wet/dry.

I cover my wet/drys to minimize evaporative water loss, but there are still
many opportunities for air and/or CO2 to get in and out. I don't see a
wet/dry filter becoming an efficient CO2 reactor.

Am I missing something here?


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