This is the best pureit water purifier I am using this one almost 7 years still my family is OK mostly they safe us the bad water and dust just we can save water this is cheap and good they has option like 9 litter or 18 litter it is up to you which one is good but 18 litter is the best one and also the Batery is very cheap means 550 start range means I think it will do you 1300 litter water so you can imagine how much one litter cost so dont play to your family health life do good eat good and drink good then we can safe the virus, bacteria, fungus and many other things so keep it mind don't ignore your life which is very importanet.