Yup, same here, used to use RO/DI than thought to myself why as the water out of the tap tests at approx 15ppm, a DI cartridge lasts a long time. Wasting a lot of water in making RO. So my current setup is a 5 micron carbon cartridge followed by a 1 micron filter cartridge followed by DI.
Only downside is our water can have a lot of turbidity in the winter but the 1 micron filter cartridge help this out to a certain extent.
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-=Bryan=-
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