Pro Tec Demineralization Cartridge - 2 pk<div style="text-align: left;"><strong>[Product Information]</strong><ul><li class="showHiddenFeatureBullets"><span class="a-list-item"> For best results， replace as necessary (every 2-4 weeks， or 15-30 fillings under normal use) </span></li><li class="showHiddenFeatureBullets"><span class="a-list-item"> For use in: V4600， V5100 and VUL575 </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51jar8PGCcL.jpg" noproxy>