Quick take
Flush new filters thoroughly, keep the feed tank clean, confirm cartridge seating and separate hot-water faults from filtration faults before escalating to support.
New-system taste
New filters and internal components may need the full prescribed flushing cycle before taste stabilizes.
Slow dispensing
Filter loading, low feed volume or an internal restriction can reduce output.
Hot water issues
Confirm temperature selection, power and recovery time before treating heating performance as a filtration problem.
Filter replacement
Countertop appliance economics depend heavily on proprietary cartridge price and availability, so keep replacement cost in the ownership calculation.