Is Hot Tub Water Safe for Plants?

Many hot tub owners wonder if the water drained from their spa can be used for watering their plants. Water is a precious resource and conserving it is essential, but is hot tub water safe for plants?

The Short Answer

The short answer is no, hot tub water is not safe for most plants. Hot tub water contains a high concentration of dissolved minerals, sanitizing chemicals, and may also have traces of skin cells, body oils, and other contaminants that can harm or even kill plants.

What's in Hot Tub Water?

Hot tub water contains chemicals like chlorine, bromine or saline solution, which are used to disinfect the water and kill harmful bacteria. These chemicals can be harmful to plants and can cause diseases, damage leaves or even inhibit growth.

Hot tub water also contains minerals like calcium, copper or iron. These minerals are essential for human health but can be toxic to plants. When the water evaporates or is absorbed by plants, minerals can accumulate in soil, causing the soil to become acidic or alkaline.

Plants that can Handle Hot Tub Water

Despite the risks, some plants can tolerate hot tub water. If you want to use hot tub water for your plants, it is essential to choose plants that can handle high levels of chlorine or bromine, as well as high mineral content.

Plants that can handle hot tub water include succulents like cacti, sedums, and agaves, as well as some ferns, bamboo, and aquatic plants. It is important to note that even these plants need to be watered with caution to avoid damage to their leaves or roots.

Tips for Using Hot Tub Water in the Garden

If you plan to use hot tub water in your garden, here are some tips to consider:

Do not use hot tub water on edible plants or vegetables.

Always test the water before using it in your garden. Use a chlorine test kit to check the level of chlorine in the water.

Consider diluting the water with fresh water to reduce the concentration of minerals and chlorine.

Water plants with hot tub water only when necessary, and avoid contact with leaves or stems.

Avoid using hot tub water on the same plants too frequently.

The Bottom Line

Hot tub water is not safe for most plants due to its high concentration of chemicals and minerals. However, if you want to use hot tub water in your garden, choose plants that can handle high levels of chlorine and mineral content, and follow the tips above to minimize any damage.

Remember, the health of your plants and the environment should always come first, so use hot tub water in your garden responsibly.