Ventilation Filters WHOLE HOME WATER FILTERS (HRV WATER COMPATIBLE)HRV WATER compatible filter pack x 2 Compatible HRV water replacement filter 1 x 10 x 4 1 2 inch Carbon GAC filter 1 x 10 x 4 1 2 inch Polyspun 1 micron filter This is a set of 2 water filtration cartridges compatible with HRV water filtration systems. The pack includes a Polyspun filter which removes most sediment and large bacteria, improving the colour and clarity of your water. The second filter is Activated Carbon for removing chlorine and fine