What is a common water conservation measure?

Retrofitting with low-flush toilets is a common water conservation measure because it significantly reduces the amount of water used in residential and commercial plumbing fixtures. Traditional toilets can use as much as 3 to 6 gallons of water per flush, while low-flush toilets use only about 1.6 gallons or even less. This change can lead to substantial reductions in water consumption over time, especially in households or facilities that experience heavy usage. By minimizing water waste, low-flush toilets contribute to more sustainable water use practices and help alleviate the stress on local water resources, making them an effective strategy for conservation.

The other options, while related to energy or water treatment, do not directly serve the primary purpose of conserving water like low-flush toilets do. For instance, installing solar panels focuses on renewable energy production, while using water softeners treats water hardness but does not necessarily decrease water use. Implementing rainwater harvesting is another valuable conservation technique, but it operates differently by capturing and using rainwater rather than reducing water usage from existing sources.