I don't need it yet however it is being sold off cheaper than usual....... if it is any good then I would purchase some "for another day", however if it is no good then I would rather pay for something that is effective. There is nothing wrong but guaranteed when/if i get a problem it will be when the only place available to obtain treatment will be 40 miles away.......... I read a review listing lots of things that CAN'T be in the system will treating so I think after all why put something in that so many stock can not be exposed too???