PP cia tank yog tsim rau ntau yam kev lag luam. Hauv kev lag luam tshuaj, lawv tau siv los khaws ntau yam tshuaj reagents; hauv kev lag luam hluav taws xob, lawv tau siv los khaws cov tshuaj ntxuav thiab etching daws; nyob rau hauv kev tiv thaiv ib puag ncig, lawv yog siv los sau thiab kho cov dej khib nyiab; thiab hauv kev lag luam khoom noj khoom haus, lawv tau siv los khaws cov khoom noj khoom haus. Cov kev lag luam sib txawv tuaj yeem xaiv cov khoom tsim nyog tank raws li lawv cov kev xav tau tshwj xeeb.
