If the water in your shower is backing up, the drain is at least somewhat blocked. Hair and soap scum are common causes of a blocked shower drain. Commercial products are available to unblock shower drains; however, these products often contain toxic ingredients and fumes. Opt for a natural method for unblocking the drain to protect your family and the environment.
Remove as much water as possible from the shower tub or floor, if it will not go down. Use a bucket, cup or similar item to scoop out the water.
Remove the catcher covering the drain if there is one in your shower. Some catchers are simply pried off with a screwdriver. Others will be affixed with screws that need to be taken out.
Remove as much visible debris from the drain as possible. Insert a straightened out wire coat hanger into the drain. Move the hanger around and pull out any hair or debris blocking the drain.
Pour ¾ cup baking soda slowly down the drain. Follow up by pouring ½ cup white vinegar slowly into the drain hole. Cover the hole immediately after pouring the vinegar into the drain. Use a drain plug or stuff a rag into the drain hole. Make sure to completely plug the hole. The vinegar and baking soda will cause a foaming, eruptive reaction, so it is imperative to not let the substances escape the hole.
Allow the mixture to sit in the drain for at least 30 minutes. In the meantime, fill a pot with 1 gallon of water, place it on the stove and bring the water to a boil.
Remove the drain plug after the 30 minutes have elapsed. Carefully pour the hot water into the drain. Pour the water slowly and use caution to avoid splashing the water or burning yourself.
Repeat this process if the drain is still clogged.