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www.wikihow.com/Unclog-a-Sink

Pour caustic soda down the drain. Caustic soda, or sodium hydroxide, is an extremely strong chemical that will dissolve most blockages clogging up your sink. Caustic soda can be purchased at most hardware stores. Dilute 3 cups (750 ml) of caustic soda with 3/4 gallon (3 L) of cold water in a large mop bucket.

www.doityourself.com/stry/using-caustic-soda-to-unblock-drain-clogs

Caustic soda, or sodium hydroxide, is a chemical that has several purposes. You can purchase it at a hardware or home improvement store. It is used in wallpaper stripper, to strip furniture for refinishing and most commonly used to clear blocked drains. Keep these tips in mind when using caustic ...

www.hunker.com/13417067/caustic-soda-for-drain-cleaning

Caustic soda can be purchased in concentrations of 50 percent and higher from stores that sell commercial and industrial cleaning supplies. When purchasing caustic in high concentrations, keep in mind that it is extremely corrosive and that it is not necessary to use very much to dissolve drain clogs.

simplyhometips.com/unclog-bathtub-drain

10. Caustic Soda (Lye) Handle this method of drain cleaning with extra care. It is toxic and can harm skin, eyes, and pipes. You might consider this a last resort type of remedy. Wear goggles and gloves when handling this substance and keep is away from children. Use 3 cups of Caustic Soda mixed with a bucket of cold water almost full (3/4).

en.wikipedia.org/wiki/Sodium_hydroxide

Sodium hydroxide is a popular strong base used in industry. Around 56% of sodium hydroxide produced is used by industry, 25% of which is used in the paper industry. Sodium hydroxide is also used in the manufacture of sodium salts and detergents, pH regulation, and organic synthesis.

forums.digitalspy.com/discussion/1892258/blocked-drain-caustic-soda

My outdoor drain that the kitchen things run into (dishwasher, washing machine, sink etc) seems to be blocked, there's standing water in it. I have some caustic soda, can i just tip it into the standing water as dry powder, or do I mix it into water first and then pour it in?

www.pennilessparenting.com/2012/11/how-to-unclog-sink-drain-diy-plumbing.html

How to Unclog a Sink Drain, DIY Plumbing, and Why To Never Use Caustic Soda for Clogged Pipes Imagine coming home ravenous after a long day, needing to cook supper because there is nothing ready to eat in the house, but the counter is full of dirty dishes and so is the sink, and there is nothing clean with which to cook your dinner, nor a clean ...

www.mica.co.za/how-to-clean-your-drain

CAUTION: Caustic soda is very corrosive, so wear eye protection, rubber gloves and old clothes, and do not run the tap so hard that it causes splashing. Have the plug attached to a length of string or its chain so you can remove it without your hand having to go into the caustic soda solution.

www.reference.com/science/uses-caustic-soda-5f9c9ff648ba7ab7

As its name implies, caustic soda is caustic and one of many alkaline compounds that are referred to as lye. NaOH, or pure sodium hydroxide, at room temperature is an odorless, white solid. Caustic soda should be used with caution, as it is an alkaline corrosive that can be hazardous.