JBL ClearMec Pad CristalProfi e400 e700 e701 e900 e901 For crystal clear water without algae problems. The foam edging ensures a slow water flow through the pollutant eliminator in the centre. Set contains: 2 x shaped foam pads (20 ppi) with cut-off; 1 x nitrite, nitrate & phosphate remover in net bag for CPe 400, 700, 701, 900, 901