I am using aquagurad RO since kast 3 year and I got no problem using it.The service of aquagurad is very good.Just you have to make one call and the customer service will contact you in that day itself.The maintenance of aquaguard is very less.
Only we have to change its filter once in a year that cost only 1000 rs.so its maintaince is only 1000 rs/year.The water comes fast as soon as you on the switch of aquaguard.There is nothing in it to clean.Aquaguard is the most trusted brand.Go for it.