Sim550 Refill Kit
The Sim550 Refill Kit includes a 10″ charcoal filter, 10″ sediment filter, and 21″ DI cartridge.
The pre-washed charcoal filter should be changed every 6 months.
The sediment filter should be changed if rusty in color, or every 6 months – whichever comes first.
The DI cartridge should be changed when your TDS reading reaches 10. How long this takes depends a lot on the water quality in your area.
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