I love this product -- it made a huge difference in removing hard water film -- BUT be careful. It can also remove decals, paint, decoration, etc. I bought a new quart Pyrex measuring cup and the first time I washed it all the markings came off! Not a lot of use now. There is a warning on the product label that I didn't read until after the markings came off the measuring cup. It also greatly faded decals from several coffee mugs. I now use a small amount in my dishwasher every few loads. I only use more if the hardwater starts to build up again. And I never put my china in or other items that are delicately decorated.