Kent ro is usefull product our shelf.it is avoid the many health problems.water test is sweet and testy.kent ro is a electricity sever.water quality is very good.and this product is very easy to use.the warning alarm is ring that filter papar is changed.this products is design is very cool and stylish.the product is service and support is very good.i like this product. The products is easy to cleaning.i purchas this product and l am happy.i advice the people buy this product.