Southeast Pennsylvania is usually a lowland region consisting of the undulating basic. On the north and west of the plain are chains of semi-detached and usually rounded hills extending from South Mountain in the west for the Reading through Prong during the east. STPP performs a stabilizing function, protecting against https://www.tjcyindustrialchem.com/news/what-is-sodium-tripolyphosphate-stpp-used-for.html