WHALE Aquasource Water Filter 12mm Systems. Size: 308mm x 54mm. Silverised carbon filters desigend to remove unpleasant tastes and smells from your water supply. Simple to install and maintenance free. Can be mounted vertically or horizontally. Suitable for use with Whale Quick Connect flexible pipework. Lasts one full season or 4500 litres. Installed in the freshwater plumbing pipework usually under the sink. Please note this is not a bacterial filter. Maximum Pressure 4 bar (60 psi) To drain the filter for winterization open all taps in the caravan open the drain valve and tilt the caravan so drain plug is lowest and let the water run out of the drain valve. Sold in singles or Outer Boxes x 12.