I have a leak in the pump of a 1994 Dimension I spa. I want to drain the spa so I can have the pump worked on. Besides draining should I blow the water lines with compressed air or just remove the pump & leave the water lines disconnected? I live in Western NY & the temps will probably be near freezing & I don't want to damage the plumbing. Your expertise would be appreciated. jnjshaf9@rochester.rr.com