I finally found a transparent inner 10"x4.5" media cannister for the Pentair Pentek Big Big Clear 10x4.5 housing. Bulk Reef Supply had them for $25 each. Here I re-pour the choramine-removing nuclear grade color-changing deionization resin media from my prior opaque cannister into it, then re-fit into my system and test the conductivity of the output at RO outlet and the RO/DI outlets. I discuss the benefits of RO/DI water filtration for drinking/cooking at home.
I received no compensation or any other kind of shilling endorsement from Growonix, Bulk Reef Supply, Pentair/Pentek, or any other product company seen or discussed here. But for those interested, here's a link to this filter: growonix.com/ro-systems/gx-s/...