premise: How to filter wine<br>Obtain a gravity flow filter. This method of filtering is the cheapest of all the filtration methods. It works by connecting the filter body, containing a filter pad, with a siphon tube.
hypothesis: No filtering method is more expensive than any other.
reason: If obtaining a gravity flow filter is the cheapest of all the filtration methods, then there are more expensive methods.  Therefore, it is definitely incorrect to say that No filtering method is more expensive than any other.