the author of the Qilu Evening News, Zhao Wei Ren Liyuan,
the black tiger spring spring cave with steel glass
to ensure the clear and pure of the black tiger spring water. In order to prevent the garbage from blocking up the spring, recently, the staff of the circular Park in Ji'nan, Shandong, were equipped with the toughened glass on the basis of the original barrier fence.
"14 toughened glass that has just been added." Shandong Ji'nan Ring Park in charge of the person in charge of the introduction, mainly to prevent visitors to the black tiger spring hole random litter, leading to the spring jam, as well as wind weather blowing dust, pollution of the spring. "This toughened glass can withstand heavy impact, even if it breaks, it can ensure the integrity of the glass, and there will be no glass fragments blocking the spring."