Yes, you can use recycled water pipes in your irrigation system to reduce waste and cost. However, it's crucial to ensure that the pipes are in good condition and free from any damage or contamination that could affect water quality. Recycled pipes should be thoroughly cleaned and inspected before installation. Additionally, consider local regulations and codes that may govern the use of recycled materials in irrigation systems. Using recycled pipes can be an environmentally friendly and cost-effective solution, but safety and compliance should always be a priority.