I will openly admit that it is far from ideal. My apex monitors salinity and I still frequently check salinity with my refractometers or conductivity meter, so if my new water line plugs significantly I should catch it before it becomes an issue. What I've started to do recently is I just clean the end of the line in my mixing station each time I mix up a batch. It only takes me a minute to clean and it doesn't seem to plug noticeably in the 2 weeks it takes before I mix another batch. It's an insignificant amount of work to make it to where I can keep buying the cheap salt.
I'm both lazy and cheap and in the end it would appear that I'm more cheap than I am lazy.
If not maintained and the flow in the new water line changed considerably it could be a major problem, but so far it doesn't take very much work to make it be a non issue.