Abstract: A marine toilet deodorant dispenser having intake and discharge pipes for integration into the existing intake flushing line and having a threadedly connected to a cap portion carrying an anti-siphoning device for controlling the fluid during quiescent periods, the cap portion further housing a perforated plastic container or canister enclosing a solid block of disinfectant deodorizer which chemically treats the flushing fluid for deodorizing the bowl of the waste disposal apparatus, accelerating the chemical break down of solid waste, reducing the precipitation and salt build up on plumbing fixtures, and filtering the flushing fluid, the plastic container or canister being conveniently replaceable.