This might sound like a dumb question but at the moment I'm not comprehending the whole process.Anyways to the subject,for the past few years of brewing. I've stuck to using syringe filters but right now I'm trying to broaden my horizon.So I thought I would try new brewing techniques so I decided to look up complete filter systems & bottle top filters.My question is do I have to use a vacuum pump with the bottle top filters & complete filter systems?http://www.amazon.com/Foxx-Life-Sciences-1102-RLS-Filtration/dp/B00BUR15Y2