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I test out of the RO into the bucket and then out of the bucket into the DI and finally out of the DI. There is zero change in TDS after degassing. There are no pumps needed for this process. Gravity does all the work.
I went from getting maybe 40 gallons per DI cartridge to now getting hundreds of gallons. Even if aerating added a couple TDS, which I do not believe to be true and in my experience is not true, you’re talking about an insignificant amount and could maybe cost you a few gallons total per cartridge. Far less than the cost of any filtering over the lifetime of the system.
Awesome. I have heard anecdotal stories of guys aerating their RODI water and coming in the next day and it jumping to 100. Of course that is over several hours or days. I suspect my CO2 is a little high as well because I burn through it faster than I think I should. I am going to give this method a try and see how it works.