The patented cartridge is engineered to last an average of three to four months in typical installations and to receive urine through drainholes. Urine passes through an immiscible layer of biodegradable sealant, continues through a siphon trap system and flows out through a baffle to prevent the loss of sealant. A discharge tube in the housing directs the flow of urine into the building drain system. The cartridge is designed as a replaceable component when its function has been exhausted.