Is it ok for 90 degree turns in drain line?

It is generally acceptable to use 90-degree turns in drain lines, but it is recommended to use them sparingly. Sharp turns can create areas for clogs and hinder the flow of water. To improve drainage efficiency, consider using longer radius bends or multiple 45-degree angles instead, which provide a smoother transition. Always ensure that the system is designed to handle the specific requirements of your Plumbing setup.