While this won't dissolve a solid hair ball, it is better than bleach for slow drains. The chemical reaction can help break up soap scum buildup on the sides of the pipe.
Using bleach in your drain isn’t just ineffective; it can actually be dangerous for your plumbing and your health. does bleach unclog shower drains
This is a plastic strip with barbs, available at any hardware store for under $5. You slide it down the drain, pull it up, and it physically rips the hair clog out. It is arguably the most effective DIY method for shower drains. While this won't dissolve a solid hair ball,
It’s a familiar scenario: you’re taking a shower, and slowly but surely, the water starts rising around your ankles. You check the cabinet and see a jug of bleach. It cleans everything else, so surely it can burn through a hair clog, right? This is a plastic strip with barbs, available
It is a disinfectant, not a clog dissolver. For a slow drain, try a drain snake (costs ~$5–10) or an enzymatic cleaner. For a fully blocked drain, mechanical removal is best. Bleach is at best a mild preventative, not a cure.