When your sink or tub drain commences to drain slowly consider this homemade combination of household products to unclog that drain very effectively and affordable.
You will need vinegar and baking soda.
You use one entire small box of baking soda with one bottle of 64 ounce vinegar. Note, is not important to buy the expensive vinegar or that of the baking soda.
Place a portion of baking soda into the drain, add some vinegar, then repeat until the baking soda box is empty.
Is not important the quantity of baking soda with each segment of pouring into the drain, what is of importance is to continue the process in segments to permit the baking soda and vinegar to react to each other in the drain and not before pouring them into the drain.
You will surprised how effective this application is to opening a drain and how inexpensive its cost as well.