Whole house water filters. Depending on the whole house filter system chosen they can remove chemicals, chlorine, heavy metals, herbicides, pesticides, bacteria, viruses, cysts, sediment, most colours, volatile organic compounds, bad taste and odours. Choose from Watermark certified 10 inch x 4.5 inch or 20 inch x 4.5 inch systems. Suitable for mains water, rain water, tank water, bore water and town water. For use with potable water.