Advice - DIY drain clearing may seem like a good idea, and if proficient enough, and where using the correct tools and equipment, then why not? But a word to the wise where regarding drain rods. Do not try and save money on the equipment needed to clear that blocked drain. Easily available, absurdly cheap, screw-in, universal drain rods are generally poorly made and will probably come apart within the drain while using them. And if this happens, that spot of DIY will have cost you dearly!