FREQUENTLY ASKED QUESTIONS: Q: Do | nude removal tha fitter prior to descaling equipment? A: Yea, remove fighter prior to descaling and Inspect for Integrity If needed replace with a new AQS-WHR-140. Q: Why ars there black specks In the water? A: Water filters are made from the purest carbon blocks. When the fighter ships it bounces around and Knocks carbon granules use from the block These lite carbon grannies are called fines.