Hi Everyone.

I have an old house - circa 1920, and have 1/2" water pipes throughout
the house, and a 3/4" main that was replaced within the past 5 years.
My problem is that, with 1/2" pipes, a faucet turned on downstairs
will affect the flow while someone is in the shower upstairs.

Apart from changing all the pipes to 3/4" to increase overall flow
throughout the house - an option that is going to be extremely
expensive and invasive, I would like to see if there are any other
options. For example, is there a whole-house pump that I can attach
near the main that can increase the water pressure in my house in
order to avoide the impacts I mentioned above?