Hi Peggie: Thank you for your information on the macerator pump. In your response you mentioned that aluminum tanks fail in 2 to 5 years. A failed tank would be a very big problem on our P450. There are bulkheads over top of the tank. Heck, the hoses can't even be changed with out dismantling most of the head. What is your info based on. The concern is reinforced by an odour that is coming from a location where there is no tank or hose........