Pengxi County, Suining City ndi malo a "Red Sea of China". Malo opangira zimbudzi zakomweko amagwiritsa ntchito pH mita, ORP mita, fluorescent kusungunuka mpweya mita, turbidity mita, sludge ndende mita, akupanga mlingo mita ndi angapo angapo mamita. Mamita a sinomeasure amapereka "maso" awiri kuti azindikire zofunikira pazitsulo zotayira zimbudzi ndikuwonetsetsa kuti zonyansazo zimafika pamiyeso yamakampani.
