Product review (2 stars): Problem with filter, or fridge?
I can't say for sure if it was the filter or the fridge, but had to run nearly 20 gallons through the water dispenser before I stopped seeing floating particles.  But, in fairness, I hadn't used the fridge's water dispenser for a few years, just the ice maker.  At this time, there is a chemical taste coming from the water dispenser so I'm not using it.