... Filter is blocked.Round filter O-ring agingRing is damaged.Quick changing head O-ring is changed.SolutionAfter checking, ... head O-ringVII,Accessories (1) A large ring of O-type water in filter. A little O-ring of ... you must clean the filter and replace the "O"-ring, PLS use the provided "C" type wrench ... (Figure 5) and "O"-ring asattached.After-sales service:This product is manufactured ...