What is BS 1125 – Specifications for WC flushing cisterns about? 
Adequate performance of sanitary systems is vital in maintaining cleanliness and hygiene and preventing outbreak of diseases
BS 1125 is a British Standard that discusses sanitary installations.
BS 1125 specifies requirements for WC flushing cisterns with valveless siphons, nominally 9 L (litres), for high level, low level and close coupled positions, together with the necessary flush pipes.
The cisterns specified in BS 1125 are of the type which flushes 9 L only, (i.e. the single flush type), or of the type which flushes, as selected, either 4.5 L or 9 L, (i.e. the dual flush type).
Note: Float operated valves and methods of fixing are not covered by BS 1125.
Who is BS 1125 - Specifications for WC flushing cisterns for?  
BS 1125 on WC flushing cisterns  is relevant to: 
- Sanitaryware manufacturers
- WC flushing cistern manufacturers and designers
- Quality control personnel 
- Sanitation departments
Why should you use BS 1125 – Specifications for WC flushing cisterns?  
For WC flushing cisterns to be reliable and safe to use, it is necessary that they comply with best industry requirements for optimal performance.
In this regard, BS 1125 provides best industry guidance on the materials, design, and construction of WC flushing cisterns. Requirements for flush pipes are also covered.
BS 1125 also provides guidance on the following test, that demonstrate whether your products are fit for its intended use:
- Distortion and dead load tests
- Impact test
- Front thrust test
- Volume of discharge test
- Rate of discharge test for full flush
As a result, if you are a manufacturer, BS 1125 can ensure your WC flushing cisterns offer the required quality and performance levels. You can ensure your products are safe and reliable, and effective at the point of use. As a result, incidents of product damage, poor flow, and spill overs can be minimized.
