The strainer is your first line of defense for keeping your drains clog free. A large majority of residential drain clogs are due to hair getting into the drain. The stainer, as pictured here, will do a pretty good job of capturing the hair before it enters the drain. These strainers. for tubs and showers can be purchased for around a $1 at your local hardware store. Even cheaper, your plumber will likely have a few laying around in his/her van. If you ask, he or she will likely give you one for free. A cheap investment that prevents having to clear the drain. If you do need to clear the drain, see our plumbing tip blog from November 11th, 2014, "shower drain cleaning made easy"