Copper sulphate is created during a chemical reaction between copper oxide and sulphuric acid. It is a salt compound that is used in a number of different substances that range from bleaches to dog food. The material can be lethal to plants when applied correctly, and as a result, copper sulphate is sometimes used to kill off roots that are invading a plumbing system. It should be used carefully to avoid damaging the plumbing system, but it can successfully kill invading roots over time.
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Things you need
- 0.907 kg (2 lb) bag copper sulphate
- Measuring cup
Pour 110 g (1/2 cup) of copper sulphate into a toilet and flush the crystals to introduce the substance into the sewer pipes where tree roots could be invading.
Add additional copper sulphate into the toilet in 110 g (1/2 cup) increments until an entire 0.907 kg (2 lb) bag has been emptied.
Leave your home for a day afterward so you are not affected by any resulting fumes from the copper sulphate.
Repeat this procedure every six months or as needed.
Tips and warnings
- Copper sulphate works well in septic systems as well and should not disrupt the bacteria balance in the septic tank.
- It could take several weeks before the copper sulphate completely kills the invading root.
- Do not pour copper sulphate down a sink since those pipes are normally weaker and can be corroded.
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