http://www.amazon.com/gp/product/B0040QW35A/ref=oh_details_o01_s00_i01?ie=UTF8&psc=1 Works wonders
Not too sure but I bought this one the other day and it is exactly the same as the one in petsmart http://smile.amazon.com/gp/product/B0040QW35A/ref=ox_ya_os_product_refresh_T1