Bilge water turns blue(head treatment) also very strong odor. I pulled all cushions and inspection boards and see it is on the deck undeer the tank, the hose connections are original rusty and rather weak looking. I am thinking about pulling the whole system out tank and all to ensure no tank holes under side and if not replacing all hoses and fittings.I have no fresh water to flush so we use a gal jug with treatment to pump/flush now.Periodicaly pumping out tank at dock pump out station.