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“Toy X has been recalled due to lead” is a statement our students have unfortunately heard too much in the media lately. Use this guided-inquiry activity kit to challenge students to determine how lead can be removed from a sample of contaminated water. Comprehensive background material guides students through the process of generating a hypothesis and designing a testable remediation procedure. Plan several lab periods for students to conduct their experiments and to reflect on their findings. Extensive teacher notes section provides examples and tips to ensure you have the information you need to coach your class to a positive learning outcome. The kit includes enough lead solution, sodium rhodizonate, and possible remediation chemicals for 30 students working in groups of three. A 0.01-g precision balance and other common laboratory supplies are required but not provided.