I have a water softener installed (used it for 8 years now) and the under the sink water filters. Softener is salt pallets and I always keep it 2/3rds full (salt pallets). For the under the sink filter (its the 2 3M filters system (650 gallons water flow capacity, so replacing filters about once a year. Replaced them about 2-3 months ago. Issue: for the last 2 weeks I've noticed white sediment on the bottom of my electric water kettle. It has never happened before, I'm puzzled as of what could be the issue?