Is there anything you can put into the water to get rid of leeches?

Yes, certain substances can help deter leeches in water. Salt is often used, as it can cause leeches to detach from skin and can also deter them in small quantities in water. Additionally, using vinegar or a mixture of baking soda and water has been reported to repel leeches. However, it's important to note that these methods may not eliminate leeches entirely and can affect other aquatic life, so use caution.