Summer Escapes B Cartridges， Two Pack of Swimming Pool Filters. Patented Cartridge Filter with Built-in Chlorinator.<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>•Measures 10" x 5"</li><li>•The Type B Pool Filter cartridge， Twin-Pack saves you time and money</li><li>•Clean impurities out of your pool for a safer swimming experience</li><li>•Makes pool time safer for the whole family</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41Ir2RvqpxL.jpg" noproxy>