Question about how flux affect pipes

[Bob from accounting]

I recently read that hot water in copper pipes can help dissolve unwanted flux in the line and work to help prevent excesses flux from pitting the pipe from the inside out. Cold line sees more inside-out pitting from flux.

Should I consider running hot water through all my new lines to help remove any excess flux in the lines from my joints before they become all connected, Currently they are in sections. No water is being run through any new soldered joints as I wait for the entire system to go online.

Another question I am looking at as well, if I flux and solder a joint and do not run any water through it for over a month or longer, are there any issues with not running water through the pipes to flush out what ever is left over from creating the joint. Or is it OK to simply store these joints while the remaining lines are being created in sections all to be joined at later date.

 

[James Henry]

flux will liquefy with heat and will wash away over time. I would flush the pipes as soon as possible and eventually it will all wash out.