I have a ezhydro clean in my toilet. It use to work great then one day it just fills so slow. I have tried everything that I can think of. I believe the problem is with the washer that is with the fill valve. If I take the washer out it fills fast just sprays everywhere and when I put it back it fills slow. Do I just need to replace the washer as it is only 2yrs old and looks like its still new?