I just replaced the water filter in my Whirlpool Gold refrigerator with a Kenmore filter. After drawing out the required amount of water from the new filter, I can still see particles floating in the water. They look like small instant mashed potato flakes. I have already exchanged the filter for a new one so that was not the problem. Could this be sediment in the lines or internal tank? Is is harmful? How do I get rid of it? The refrigerator is 6 years old.