Skip to content
24/7, 1 Hour Response No call-out fee, No VAT 4.97(318+)

Advice & Tips

Dangers of Drain Cleaning Chemicals

Published: 10 August 2020 Updated: 26 January 2026
Drain cleaning chemicals beside a sink

Drain cleaning chemicals are a common choice for clearing blockages, but they can be harmful to your health and the environment. There are three main types of drain cleaning chemicals: caustic, oxidizing, and acidic. Each comes with its own risks.

Caustic drain cleaners

Caustic cleaners often contain lye (sodium hydroxide), sodium hypochlorite (bleach), potassium hydroxide, or potassium hypochlorite. They create heat when they react with water, which can break down grease and organic material. The downside is that this reaction can also damage pipework, and the chemicals can cause serious burns if they splash.

Oxidizing drain cleaners

Oxidizing cleaners commonly contain nitrates, peroxides, or household bleach. They break down organic matter by releasing oxygen and heat. This can be effective, but it also poses a burn risk and can damage some materials.

Acidic drain cleaners

Acidic cleaners often contain sulphuric acid. These are extremely strong and can dissolve tissue in seconds. They can cause serious burns and are dangerous to handle without proper protection.

Safety advice

If you already have drain cleaning chemicals at home, always follow the instructions carefully, use protective equipment, and keep the area well ventilated. Keep all products out of reach of children and pets.

If you need help with a blockage, it is often safer to call a professional. Clearflow Drains provides 24/7 emergency drain unblocking across Birmingham, the West Midlands, and Coventry. Call us on 0121 694 5185 for fast, fixed-price support.

WhatsApp us