So i made a simple and VERY effective filter system.3 inch plastic T fitting the 2 sides with smooth openings, the top with threads..2, 3 inch drain caps,1, 3 inch Threaded cap for the top, 4 , 3 inch round pieces of window screening .. ..Home Depot......2 round carbon filters , and a bag of granulated carbon. Pet Smart... Put 1 screen and round filter and another screen in each drain cap and slide into each smooth ends.. Rinse granulated carbon and fill from the top.. Place the cap and attach 4 inch dryer duct to each end.. No smell at all..