There are really only three types of round, screw-in, filters that I use: CPL, ND and occasionally a clear protective filter (when working in an area that might be dangerous to the front element of my lens).
However, even though I am quite careful in attaching filters, they sometimes get stuck and are difficult to remove. There is a greater chance of threads binding with filters that use an aluminum mounting ring than those that use a brass mount.
Recently, a friend's CPL filter became stick in his lens. He asked for help. I always have a set of filter wrenches handy. They are very cheap in price and are lightweight and take up virtually no storage space. The filter wrench will allow you to remove jammed filters without defacing either filter or lens; which could be the case if you attempted to use an inappropriate tool (such as a plumber's wrench) to remove the filter.
I'd recommend anyone who uses filters to invest in an appropriate filter wrench or set of filter wrenches.
http://www.ebay.com/itm/49-52-55-58-...0AAOSwk1JWcCp~
Filter wrench sets usually come in two sizes, one size for 49-57 mm filters and the other size for 67-77mm filters. There are usually two of each size in a set. You would use a single wrench to remove a filter stuck in the lens threads and use two wrenches to separate two filters that have been stuck together.
For larger size filters, there are larger size wrenches available. My largest filter is 77mm which I use for several of my lenses so I don't need a larger wrench.
For the cost of a few dollars, you might save a lens and/or a filter from damage and certainly make life easier for yourself...