After 6 months use, I just changed my 1 micron sediment and 5 micron carbon
I still don't use my DI as my RO membrane gives me a constant 0 TDS output after a 5 min flush
For our water, I feel a sediment change every 3-6 months and carbon every 6 months is adequate, unless you don't mind changing more often
I watch my incoming and post RO water pressure, then base the filters on that
I hope to get a few years out of my membrane with this schedule and may not ever need my DI
I've never seen my sediment turn orange - it could be specific to your building's plumbing ... mine was a darker color last change and is still white right now ( 2 weeks in and half your usage )
With all the rain we've had lately, it's possible your water is dirty due to water shed turbidity, but we should be on the same water shed
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