Have you recently installed a new hot water tank and have the braided supply hoses on the top of your tank. We here at Mr. Mikes plumbing have noticed a trend in Calgary and area that when these shark bite hot water tank connectors are installed on tanks that after a few years homeowners are noticing black specks on thier tub or floating in thier bath water. We recommend replacing these lines with copper water lines. 95% of the calls we have had with regards to this black particulate have been solved by removing these braided sharkbite connectors and replacing with copper waterlines and fittings. Call us today for an estimate to replace these lines and have your tank running smoothly for years to come.