After trying several brands, I have found that it is best just to stick with the one that works best! Powder all the way! Liquid seems too messy for me, tablets don't seem to dissolve completely. With the powder, you can put in just what you want: a bit more if you have hard water; less if you don't have very dirty dishes. The price is right, in fact one of the cheapest of name brand. I recommend it to all new dishwasher users! Product is readily available wherever cleaning supplies are sold.