A lot of ro membranes cannot tolerated chlorine, so that is why you change the carbon.
The particle filter is changed whenever it clogs up and you have low flow. Usually this occurs at about 6 months. You must have clean water if the filters are not yet plugged after one year. Check the tds after the membrane to see if you should change filters.
Whatever passes through the membrane is taken out by the DI. So if at the end, tds is zero, your DI is still good.
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