I'm proud to say that I have substantial experience with composting toilets (both because it's true and funny) from Clivus Multrum: http://www.clivusmultrum.com

I'm proud to say that I have substantial experience with composting toilets (both because it's true and funny) from Clivus Multrum: http://www.clivusmultrum.com/products_system_process.shtml http://www.clivusmultrum.com/products_system_process.shtml The main trick they use to avoid the smell is a fan that pulls air down past the seat and then vents it out the top. If it's set up right, you smell nothing but the roses outside (or whatever is nearby). Plus, you get badass compost for free.