4 stage RO/DI needs changing but which filter(s) ??

[kien]

Originally Posted by christyf5

LOL, pretty much. Depending on heavy use or what the TDS is like going in, its probably best you replace all except for the RO. You could just try replacing the carbon and micron filters and see what you get for TDS after that but if its been awhile since you've changed the DI it might be a good idea to change that out too.

so in other words I should/need to change out all my filters!