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What is the correct procedure for using chemical drain cleaners when dealing with a clogged sewer?

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Correct Incorrect Flushing first can remove surface debris and improve the cleaning effect

What is the correct procedure for using chemical drain cleaners when dealing with a clogged sewer?

• Flush the pipe with water first, then pour in the drain cleaner
• Pour in the drain cleaner first, then immediately pour in hot water
• Pour in the drain cleaner directly without any other operation
• Mix it with laundry detergent and then pour it in