Intex Type A Filter Cartridge for Pools， Twin Pack<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Now available in a convenient twin pack</li><li>Easy to clean Dacron fiber material</li><li>Filter cartridge should be replaced every two weeks</li></ul></div><img src="http://ecx.images-amazon.com/images/I/51i2IY0nCWL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/615IOafCOhL.jpg" noproxy>