I just figured out i had a r/o system under my sink , well actually i knew a while ago but i was too lazy to post . i also figured out that I hav been usin the wrong type of water all this time , brita , refrigerator and others i can't remeber . well now i'm not gonna make that mistake. well the r/o system i hav has 3 filters and it is less then 13 years old , I need to replace the filter , how many times do you have to change the filters and how much do they usually cost , and where can i buy them . my system is weak , it make 2 gallons and after that it is weak and make about 1 gallon after 30 minutes or mor . i am still able to use it after all these years or if i use it it will be only dirty water .