20CM linear shower floor drain

What are the methods to unclog the shower drain?

Boiling Water
The first thing you should try using on your clogged Shower Floor Drain is boiling water. This method is pretty easy to do, simply boil a pot of water and dump it down the drain. If you can, try using a funnel to concentrate the water.
Baking Soda and Vinegar Solution
If you want something stronger than boiling water, but not as harmful as chemicals, then baking soda/vinegar is a good solution. 
Pour one cup of baking soda into your bathroom Floor Drain. Allow the baking soda to sit in the drain for a few minutes. This will give it time to coat everything. Then, pour a cup of white vinegar down the drain.
Ideally, this will dissolve any of the hair or debris in the drain. However, it will take a couple of hours. Once enough time has passed follow it up with some boiling water.
Remove the Debris With a Hook
Next, it’s time to try physically removing the clog. In some cases, you will be able to do this with your hands, but only for hair and small objects near the service. Anything else will require a longer tool that can reach further.

  Kaiping Jinqiang Hardware Products Co.,Ltd founded in 1993, Has more than 20 years of stainless steel production experience. Now mainly production is floor drain, exported to Korea, the Middle East, Southeast Asia, North America and moreKaiping Jinqiang Hardware Products Co.,Ltd founded in 1993, Has more than 20 years of stainless steel production experience. Now mainly production is floor drain, exported to Korea, the Middle East, Southeast Asia, North America and more