Where to buy RODI cartridges?

Auqafx or filter guys really have to watch where and what you get . These 2 places have very good service and good product
 
I just bought an inline di cartridge from the filterguys there also in the hobby as well .just remember to get a tds meter to test your RO. If it's at 0 you may not need a DI cartridge but it's an added
safety feature. GOOD LUCK
 
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