CatGenie Maintenance Cartridge， 15 oz<div style="text-align: left;"><strong>[Product Information]</strong><ul><li><span class="a-list-item"> Removes lime and grime </span></li><li><span class="a-list-item"> Each Cartridge is good for 1 year (4 cleanings each cartridge) </span></li><li><span class="a-list-item"> Process takes 1 hour </span></li><li><span class="a-list-item"> Always remove after use </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51LV8e4KrKL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31UiBJnVTTL.jpg" noproxy>