Article in English: You’d be amazed by how dirty your bathtub can get, for a place where you go to get clean! Since you’re taking a sitz bath to promote healing to injured tissue, you want to be extra sure that the environment is sterile.  Use a bleach-based cleaning product to sterilize the bathtub before drawing your sitz bath. Scrub the tub thoroughly to make sure you’ve removed all the soaps and other bath products that have accumulated on the surface. Rinse the tub thoroughly to remove both the soaps and the cleaning products. It’s very important that the water you use in your sitz bath is warm, but not scalding hot. The temperature should not cause any discomfort that could cause irritation or inflammation. Warm water, though, will increase blood flow to the injured tissue, speeding up the body’s healing process in that area. Dip your finger into the water, or place a drop or two on the sensitive skin on your wrist to test the temperature. Make sure that the bathtub is plugged so the water doesn’t drain out, then run the water until there’s enough water in the tub to fully immerse the area that’s giving you trouble. You don’t need to add anything to the water, as the warm temperature alone will make you feel better. However, there are many things you can add to your bath to treat different problems. Ask your doctor for a recommendation on what to add to your bath.  Salt is a good general additive for any sitz bath, regardless of the reason. Bring the water up to a temperature warmer than you’re comfortable with, and add ¼ cup of salt to it. Mix thoroughly so the salt dissolves throughout the water, then let the water cool to a milder temperature. If you have a vaginal infection, add 1/2 cup of table vinegar to the salt water solution. An herbal solution is good for treating hemorrhoids, as well as damage from tissue trauma like giving birth. Mix 1/2 cup of Epsom salt, two tablespoons of baking soda, 2 tablespoons (29.6 ml) of witch hazel, 1 tablespoon (14.8 ml) of olive oil, 8 drops of lavender essential oil, and 8 drops...

Summary in Chinese:
清洗浴缸。 调整水温。 往浴缸里注入8-10厘米高的水。 如有需要，可以往水里添加一些有舒缓作用的东西。 浸泡在坐浴盆里。 坐浴完毕后，拍干身体。