How much an enhanced DIY version of a Trimix stick would cost ?

[tbone1004]

By any chance do you have an example of a pre-filter for in-take ?
noted for water traps

What about CO/CO2 absorption can it really be 0 ppm for both ?

the intake filters just look like engine filters and have replaceable pleated filter elements
NP-2221-0563A – FILTER TECHS

CO and CO2 can really get to 0ppm with enough filtration and a proper coalescer. The key is to get the air cold so all of the moisture falls out before it hits the filters. If the filters are oversized, you can get damn near all of it out. Is it practical/cost effective/necessary? usually not

 

[Darghu]

For scuba diving, it is not okay to have even 3-5 ppm CO right ?
Where come from that CO ? (it's after the air-compressed from the compressor right ?)
What is the acceptable rate for CO2 ?

I read that infos :
CO2 removal from Breathing Air
http://prntscr.com/fryh4v
LAWRENCE FACTOR® – High Pressure Filters

Can we DIY a Filtration system support for it ? a metal structure where all those Filters are correctly linked together.

 

[tbone1004]

CO is limited to 10ppm in the US, and 3ppm in England. We usually use 3ppm especially if going deep.
CO2 is limited to 500ppm

you can make your own station for multiple towers if you have welding and fab experience. They also sell fixtures to hold them. You can also just strap them to the wall