I had a guy tell me that when a system is not running that the moisture dose not stay in the filter dryer but migrates back towards the condenser
this is news to me I thought dryers were to hold any moisture in the dryer
any truth to this ?
You're right, the filter drier is designed to trap and hold moisture, and it can become saturated. This is why they should be replaced periodically. Using a manifold with a sight glass is a good tool to monitor the system.