i agree with the above posts i myself had dwc and they need to be checked every day sometimes multiple times a day never trust a product to do what it says most of the time its an over exaggeration. think of it like a 2x4 there not really a 2x4 any more are they on the same sense other companys are allowed to get away with this over exaggeration. you should check it every day at least once personally i did mine 2 times a day