Am having water flow trouble only 6 lpm. Installed all plumping myself and checked for leaks before putting down floor and tiling (non found) but worried that there is something I missed, cant be major as downstairs neighbour not getting water leaks. I don't have a water meter to check. Any help appreciated

. I don't have a water meter to checkAre you on a pump? If not please explain. Back to you, Tom