Cation and anion DI resins
Cat must be BEFORE ani!
No CO2 in the incoming water!

Anion resin:
https://airwaterice.com/collections/di-deionization/products/anion-di-resin-color-changing-bulk-media?_pos=14&_fid=1c953db41&_ss=c

Cation resin:
https://airwaterice.com/collections/di-deionization/products/cation-di-resin-color-changing-bulk-media?_pos=12&_fid=1c953db41&_ss=c

Clear refillable cartridge – 20×4.5 x 2
https://www.freshwatersystems.com/products/20-x-4-5-clear-empty-refillable-water-filter-cartridge?variant=31454148689995&c1=GAW_SE_NW&source=PLA_USA_PM_TOP&cr2=pmax__-nw-__shopping_top_products&kw=31454148689995&cr5=pla&cr7=c&hsa_grp=&hsa_ad=&hsa_tgt=&hsa_kw=&hsa_mt=&gad_campaignid=22253574867

Clear water filter housing – 20×4.5 x 2
https://www.walmart.com/ip/20-Transparent-Big-Blue-Housing-for-Whole-House-Water-Filtration-System-1-Brass-Port-Mounting-Hardware/647080695?wmlspartner=wlpa&selectedSellerId=16704

Pump 3400 lph
https://www.saltwateraquarium.com/universal-pump-1262-3400-eheim/