How can I fix that problem?. Every time the pump go on it make a lot noise,how can I reduce that pressure on the pipes?
I need you help please
Thanks

Your son installed a submersible pump INSIDE your aerator tank? Why?

how can I reduce that pressure on the pipes?
Is this the pipe from the tank to the house? What's the PSI coming out of the tank and why do you wish to reduce it?
I live in Florida where we have stinky water and I've plumbed aerator systems. Is this pump your son installed made for a aerator system? Again, I need to know the PSI entering your house. If you don't have a pressure gage installed purchase a hose bib pressure gage,(see image) and let me know. Cheers, Tom