Are you actually using a reverse osmosis cartridge? It sounds like you just have sediment, carbon, and deionization cartridges. The 1 and 5 micron will be either sediment filters or carbon blocks. A RO cartridge won't have a micron rating. The order they should go in (in whatever multiples you may need) are sediment, carbon, RO, DI. The deionization (DI) cartridge will wear out very very quickly if the water isn't RO filtered before it enters the DI cartridge.
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~ Mindy
SPS fanatic.
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