Red Seal Plumbing Practice Exam 2026 - Free Red Seal Plumbing Practice Questions and Study Guide

Coliforms are bacteria commonly found in the feces of warm-blooded animals and their presence in a water system could indicate possible contamination. To eliminate these bacteria, a chlorinator is necessary. This option is the most effective way of disinfecting water and killing off harmful microorganisms. Options A, B, and C do not specifically target or eliminate coliforms and therefore would not be useful in this scenario. A water filter may remove some potential sources of contamination, but it does not necessarily kill bacteria. Similarly, a water softener is mainly used to remove minerals and does not disinfect water. A UV light purifier can kill some bacteria, but it may not be effective against certain strains of coliforms. Therefore, a chlorinator is the necessary equipment for dealing with coliforms in a water system.