![Filters for the machine of HTW-A4](http://www.healthiertapwater.ie/cdn/shop/products/IMG20220714203758_{width}x.jpg?v=1659739636)
All filters for under sink HTW- A4.
1st stage (5 micron PP cotton element): remove coarse particle impurities, sludge, colloid, suspended matter for example. Filter replacement time= 9-12 months;
2nd stage (activated carbon filter element): adsorbs peculiar smells, heterochromism, organic matter, chlorine, pesticides, herbicides, nitrate, microplastics for example, Filter replacement time= 9-12 months;
3rd stage (5-micron PP cotton element): remove fine particle impurities, sludge, colloid, suspended matter for example. Filter replacement time= 9-12 months;
4th stage (reverse osmosis membrane): RO is a process through which water pressure pushes the tap water through a semi-permeable membrane that allows relatively small water molecules. Theory filtration accuracy of 0.0001µm, removal of bacteria, viruses, heavy metals, and other organic impurities in water. Filter replacement time 12-24 months;
5th stage (post activated carbon): absorb peculiar smells and removes residual taste and odour of filtered water to produce final purified water and improve taste. Filter replacement time= 9-12 months.