Extra worked problems on detention time, chemical dosage, flow and percent removal, so the math becomes routine before exam day.

How to take, label and run the routine tests (chlorine residual, turbidity, pH, BOD, TSS) drawn step by step, so you stop second-guessing the bench.

Printable checklists for daily rounds, pump checks and lockout/tagout, ready to clip to a board and use on your shift.