Does a great job, my only quibble.. you determine the amount of product to put in it by the size of your tree. My trees are young, but they still need 6 fertilizer tabs.... there is only room for 5. So, you have to add another after the others dissolve. Not a huge deal, but thought it was something to mention. EDIT: I realize, you are expected to move the location of the device to water around the tree, so maybe putting in more tabs THEN would work.