Do any of you use a sealant remover or oil seperator when you recover refrigerant? I've been thinking about getting one of these:

just because you never know what your customer or any one else has tried to pump into a system before calling you to fix it.

"The removinator", and all the others that look just like it only with a different name, are a bit pricey. Not to mention that the relacement filters for them are about 35 bucks. Any other suggestions?