6 stages will be a nightmare to maintain. Most municipal water sources won't need more than a 3 stage system: sediment filter, RO, and carbon. You can add a 4th stage for re-mineralizing. You need to have really dirty water to justify needing the 3 sediment filters on this system.
I'd beware of a cheap RO. I had a filter housing split apart at the bottom in the middle of the night and flood the main level and part of the basement in my house.
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Thank you!