Depends what your tap water is like. My tap water has a tds of 92, and the water coming out of my RO is 1 ppm, so my DI cartridge doesn't have to work very hard at all.
I think each DI cartridge can only filter up to 40 ppm, so if your water after going through RO is higher than 40, then you'll need additional DI. I am not so sure I am correct on that though...
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~ Mindy
SPS fanatic.
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