Can I reuse brand new filter if I'm just repeating changes in order to eliminate all water in system? The filters are pretty pricey, and I intend to use a new one on the last change. I have thrown away the first filter before the changes. Thanks for any cleaning tips or other advice. I know in a perfect world we'd all use new filters everytime, but wondering if since all the water isn't eliminated anyway, how much difference it makes if I am changing the oil 3 or more times.