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Toilet cistern displacement devices

WTR07

Older, larger toilet cisterns typically use far more water per flush than is necessary, this easy conservation remedies this.

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A cistern displacement device (CDD) is an object that is placed in the toilet cistern to reduce the amount of space available for water to fill each time the toilet is flushed. A range of differing types are available but they achieve the same objective, less room for the water. Generally, cistern devices are recommended for use in older toilets which have a greater maximum flush. Over time toilets have become more efficient, before the early 1990's there was no consideration of water conservation and a cistern may have held 9 - 12 litres, which was flushed at every use. Later in the 1990's designs changed favouring a 7.5 litre flush. Further changes were made in the early 2000's to reduce the volume of water per flush to 6 litres. As such cisterns installed from the early 2000's onwards have a maximum of 6 litres therefore CDDs are not recommended, however with toilets having a long life span many many toilets from last century remain. The CDD is typically just placed inside the cistern, requires no power and no ongoing maintenance, a real easy retrofit.

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Carbon savings too!
Although the carbon footprint of unheated utility water is relatively small at around 0.0003kg per litre, when it is multiplied by the number of toilets in use and the significant volume of water flushed each day it is actually quite significant. As the average toilet uses between 7 to 13 litres of water each flush, then by fitting a Cistern Displacement Device (CDD), approximately 1.64kg of carbon dioxide could be saved per year per toilet, based on an average UK household. Collectively, this could save 600 million litres of water a day in the UK, or over 65,000 tonnes of carbon dioxide each year, imagine what this number would be scaled up globally! As toilets use about 30% of the total water used in a household, fitting a CDD will not only reduce your water consumption but will help reduce the carbon footprint involved in the production and pumping of the water by the utility company.

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Disclaimer: The advice given in this conservation measure is given in good faith, with every use case and facility being different we cannot assert that this conservation measure is appropriate for you. You are recommended to take appropriate advice before implementing any change. SDGAssist cannot be held liable for any loss resulting from your implementation of this measure.

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