If you are careful with dangerous chemicals and want the best value for money, buy it. If you have expensive plumbing, children, or a poor sense of balance, spend the extra £2 on a bottle with a child-safe cap and fume suppressant.

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After 20 minutes, a kettle of boiling water was poured down. The result was a satisfying “glug-glug” as the water vanished immediately. The slow drain was cured in a single application.