The best way to avoid a clogged shower drain is to actively prevent clogs from happening in the first place.  Follow these steps to keep drains clear.  

• Invest in a drain protector.  This will catch hair before it goes into the drain.
• Brush hair before washing to get out all loose hair outside of the shower
• Don’t pour dirty mop water down the shower drain as the dirt and debris can clog the drains.  Pour dirty water outside.  
• Avoid oily products in the shower.  Oil is difficult to rinse away and can stick to dirt and hair that is already in the drain causing a slow drain.
• Keep up with scheduled drain maintenance.  Pour boiling water or baking soda and vinegar into the drain once a month to keep drains clear and water moving.