Operator drill: Filters and ponds

10 questions · Untimed · Every option explained

Trickling filters, recirculation, sloughing, ponding and flies, RBCs, facultative and aerated ponds and lagoons. Ten questions from our filters and ponds bank, with an explanation for every option.

Line drawing of a round trickling filter with a rotating distributor arm over rock media, beside a stabilization pond with grassy dikes

Before you start

Most questions have four options and one best answer; true/false questions have two.
Check each answer to see why every option is right or wrong before moving on. Checked answers cannot be changed.

Game Assessment Prep is an independent practice site, not affiliated with or endorsed by Water Professionals International (WPI, formerly ABC), the California State Water Resources Control Board or the Texas Commission on Environmental Quality. Every question is original; none is taken from a certification exam, an official study guide or another prep provider.