Been running filter rollers for years now. The earlier models had issues and people 'shun' technology. I've had a 1st gen Klir which was trash, and I currently have 3 different bubble magus filter rollers in service currently. Using coolant filter paper to save a few bucks on rolls versus the bubble magus brand stuff. I'm more than happy with them and will never go back to socks. With the filter rollers, I can easily go 14+ days between touching my systems for anything. My rolls typically last 8-10 weeks on average.