Do you have a water pressure gauge? Handy item to help diagnose production issues & also when to change filters. I can often tell visually when my 1st stage 5 micron sediment filter is due for a change through the clear filter housing. It gets quite yellow/rusty looking. But the primary indicator for me comes through the use of 2 pressure gauges, one providing the source pressure (plumbed in before the first stage) & one providing pressure right before the RO membrane. This gives me a pressure differential reading & when that starts to rise, it's time to look at the pre-filters. The less pressure loss between pre filters (including carbon stage(s)) & the RO membrane, the cleaner they are.
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