If you don’t rinse drain cleaner out as directed, concentrated chemical may remain in the drain. It can cause burns or irritating fumes and, with prolonged contact, may damage susceptible pipes, joints or seals. The risk depends on the product, contact time, pipe materials and whether a blockage has trapped the cleaner.
Why trapped drain cleaner is hazardous
A blockage can hold concentrated cleaner in one section of pipe instead of allowing it to disperse. Some formulations may generate heat or affect certain metals, plastics, rubber seals or jointing materials. Damage is possible, but not inevitable.
The more immediate danger is chemical exposure. Splashback can injure skin or eyes, fumes may irritate airways, and anyone later opening the drain could be exposed.
What to do now
Keep people away and check the product label before adding water. Use only the waiting time, rinse method and water temperature specified by the manufacturer; different formulations require different handling. Check the product’s current safety data sheet if available.
- If the label permits rinsing and the drain is flowing freely, follow its directions exactly.
- If the label is missing or unclear, contact the manufacturer for instructions.
- Never add bleach, acids, another drain cleaner or a homemade remedy. Mixing chemicals can cause dangerous reactions.
- Do not lean over, plunge or dismantle the drain, or insert tools. Trapped cleaner may splash or spray.
- Do not run the tap if the drain may overflow.
- If fumes are present, leave the area. Ventilate only if you can do so without exposure.
- If cleaner is pooled, the drain remains blocked, the product is unknown or a leak appears, stop using the fixture and contact our Sydney plumbing team. Tell us the product name, amount used and when it was applied.
If nobody has been exposed but cleaner remains trapped in a blocked drain, contact our licensed blocked drain plumbers and disclose the product before they attend.
For skin or eye exposure, inhalation or swallowing, follow the label’s first-aid instructions and call the Australian Poisons Information Centre on 13 11 26. Call 000 if someone has severe breathing difficulty or another life-threatening reaction.