do not ever use chemicals for your drains, you are litterally dumping money down the drain. When it comes to drain cleaning, you are better off calling someone like myself(Roto Rooter), yeah it cost some money, but you get what you pay for. Lets say you wanna cable a drain yourself, ok, so you go and rent a machine for $50 from the rental store, then you have to try and clean the line. Cable a drain is a skilled trade, its not just shoving a cable in there. You have to know how to feel for turns, offsets, roots and so on. This takes years of practice to know this stuff. If you dont know it, you are going to hurt yourself with the cable wrapping itself around your wrist or hand and breaking it. Then to make it even harder the machines you get from the rental place usually are not big enough to even clean the line correctly, or the cables are so old, rusty, kinked that even someone like me could not get it open with those machines. I recommend calling a professional, we do the work, we do it rght, and it is headache free for you. I am telling it is not worth it to try and do it yourself. By the way, lets say you do have a bigger problem than just a clog, people like me can discover the "real" casue of the problem and offer a solution for you.