Its a good product I have been using it since 15years.should keep in check the maintenance of filter every six months at least or maximum till one year.in case of power cut no access to this can be bit difficult , so you need to have separate water tank connection attached to this filter.when the filter is not in use it will automatically purify water and keep that as a storage in the water tank.this is a RO+ UV filter.reverse osmosis ( RO) removes large particles like viruses, bacteria’s and impurities.it can also remove TDS( total dissolved solids) and unwanted ions from water.there are two types of filters one is carbon filter and other is sediment filter.periodic changing of filters once every 6-8 months should depending on type of water which is purified in this.there is a water level indicator also present in the bottom right side of filter.