This product may seem superfluous and I have long hesitated to use (at least regularly). However, it must be recognized that with use, it allows your dishes stay clean dish (I too had trouble conceiving it to be dirty since it the end of a cycle it looks clean ). For the long term, smells begin to grow in your dishwasher if you do not maintain ... bad odors = bacteria, which is not very reassuring for the dishes coming out of the wash! With this dishwasher cleaner additive SUN, used regularly finished odors, so finite bacteria, and hello dishes that feels good on the edge of a wash cycle of a dishwasher clean and smells good too! I use one every 3 months or so, sometimes less, I also think that effectively extend the life of my dishwasher, which is great also!