Particles floating in whirlpool filtered water.

Question

Few months back I noticed particles and thread like things floating in the water from side-by-side whirlpool refrigerator. I changed filter twice, drained lots of gallons of water both time but water is still not clean. I changed complete water tubing still the same problem. I drained water with and without filter (several gallons) and still the same problem. I checked tap water and it is cleaner than fridge water. Any idea where is the problem? Any solution?

 

VP