Hi guys replaced my filters for the first time today obviously assuming that it was carbon + sediment. Carbon was fine replaced that when it came to the sediment I found these. I've worked a lot with filters but this stumped me!!! I have tried to upload the photos I took but they are too big I can only describe it as little black crystals with a tiny filter at the top inside blue casing. I’ve just put the sediment filter in and I'm getting 000 so seems to be working fine again. But I would really like to know what this is. Does anyone know??