Very poor marine pressure? We have tough water, galvanize pipe, private well. If any dampen is...

We have tough water, galvanize pipe, private well. If any dampen is on we have no pressure anywhere. Toilets flush poorly. Appliances don't work resourcefully. Water outside has angelic pressure. We installed plumbing ourselves 30 years ago and it has never be great but is now particularly frustrating
Answers:    Most likely mineral deposits hold formed throughout the pipe, leaving the pipe restricted. The best means of access to check this is shut the water rotten, and open up a smudge. If you used galv. then you most likeley used threaded fittings. Most potential, you are going to end up, up grade to copper or PVC.
Your galvanized pipeing is pluged full of rock-hard sedimant. my home was duplicate . we had to replace the pipes beside copper.