The AquaCera LP5 CeraGrav Gravity Water Filter System with 7 inch CeraCarbFilter is designed to work without electricity, using gravity to filter the water in the upper chamber through the filter candles in the lower chamber. The AquaCera CeraCarb OBE Filter is a Ceramic composite water filter that is infused with a special mix of carbons. This results in exceptional removal of chemicals. AquaCera CeraCarb OBE Filters also reduce cysts and bacteria. The AquaCera CeraCarb OBE Filter Features The AquaCera LP5 W9375016 has a 7 gallon capacity and can hold up to 5 AquaCera filter candles., making it perfect for a variety of applications from camping and emergency situations to everyday use. Can be used with 7 or 10 inch CeraCarb filter candles.