ro/di cartridge question

[kurens]

hey guys,i got SpectraPure® Maxpure 90 GPD and think its time to replace filters.i got inline tds meter and its not look good
Should i change every 3 of them and which di cartridge you recommended.

 

[trackfast]

I would change the sediment filter and the carbon block. Your DI should be refillable; I would go with a color changing resin.