Sodium hydroxide - caustic soda - NaOH
Dissolves fats, dismantles drains, disinfects. Purity: 99%.

Apart from home use, it is also used in many other applications, such as electrolysis, biofuel production, raw material processing, etc.

Caution!
Causes severe skin burns and eye damage. It can corrode metals. Do not breathe dust - smoke - gas - cloud - vapors or spray containing it. Wear protective gloves, clothing and eye and face protection.
In case of contact with your skin or hair:
Immediately remove all contaminated clothing and rinse skin with water or shower.
In case of contact with eyes:
Rinse carefully with water for several minutes. If you wear contact lenses, remove them as soon as possible and continue rinsing.
Call a poison control center or a doctor immediately.

Remove any water left in the clogged drain
Pour about 200g of potash and add 2 liters of boiling water AVOIDING evaporation.
After a while, turn on the tap and let plenty of water run
Try again if necessary
If after 2 times it has no effect DO NOT CONTINUE. There is probably another type of drainage damage
Not recommended for the toilet bowl