Could Shower Water Be Good for Plants?

Irrigation Method

• According to Oasis Design, shower and other gray water is best distributed via underground feed, which allows the soil to filter bacteria and other contaminants. Avoid applying gray water directly to lawns and garden plants, as this poses a health risk to humans.

Detergents

• Shampoo, body wash, and other soap and detergent products may help or harm plants, depending on their ingredients. Detergents high in boron or sodium can damage soil and hurt plants, while detergents based on phosphates can make them grow stronger. Phosphate detergents also encourage growth of algae and pest plants in waterways, and are banned in some areas.

Soil Quality

• Regular use of shower water for irrigation can cause soil quality problems. According to the Resources, Conservation and Recycling journal, watering only with gray water can increase soil alkalinity and salt levels. Alternating grey water and regular water irrigation reduces this problem.