This can of pump saver will give you 2-3 applications per can, you should get 3 as long as you conserve on each application. I would definitely suggest you use this product repeatedly if you are using your pressure washer in cold months. This product will prevent any water left in the pump from freezing. I would not recommend that you run regular antifreeze through the pump. There is a certain chemical in most antifreeze that can dry out the seals within a pump.