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ASTM Method E70 and Storage of CO2 Free Water - What do you use?

Hello All,

I am implementing ASTM E70 pH of Aqueous Solutions and have been trying to find a reasonable storage container for the CO2 purged Type II Reagent water needed to prepare the borax standard. I need it equipped with a CO2 filter. The only container I can find readily available is >$1500. Does anyone have an alternative that they use in their lab that they are willing to share? Thanks in advance! 

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