looking for this --- air filter canister
 

That is just a RO filter canister with a removable/refillable cartridge. If you find a canister I am sure I could find a cartridge in my "stuff" for you for free.

Fyi that's just a DI canister without the resin. You should be able to find one pretty easily.

CO2 scrubbing
 

okay so most of have probably guesses that I am trying to do that CO2 scrubbing with soda lime to raise ph by feeding the protein skimmer more oxygen by scrubbing away the CO2..

has anyone tried this before ???

I ran an airline outside for my skimmer intake, and put a filter on it (outside) to keep bugs and road dirt out. Hell of a lot cheaper than changing out soda lime

yep
 

that's what I'm doing,, skimmer intake running outside...

I have 2 window fans,, both blowing out,,, with another window open,,running 24/7

I have an airstone that vents into my MP10 every 30 minutes for 2 minutes,,

I have a GYRE 150 kicking up a wave that would scare Johny Utah...

and still my pH is dropping to 7.69 every night...

alk is low 8's...

If you have a sump, consider running your sump lights for the macro algae, on an opposite light cycle than your DT lights