While investigating the effectiveness of water saving devices in the home - with particular focus on Cistern Displacement Device's (CDD's) - tha...

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While investigating the effectiveness of water saving devices in the home - with particular focus on Cistern Displacement Device's (CDD's) - that is; water permanently retained within a W.C. (toilet) cistern - via sub-resevoir type container (filled bottle) or simply any material composition (brick, etc.) placed within the cistern that has a desired saving. Herein lies a question: in so doing - what of the subsequent effectiveness of the flushing action within the pan - to "adequately" dispose of the waste? Water companies in the United Kingdom - and as part of their WRMP's are obliged to submit to the regulators (OFWAT, DEFRA etc.) among other things - 'water demand' reduction strategies. A prominent feature of most of the companies efforts in doing so is the advocacy (freely available) in the use of CDD's. However, post-2001 water regulations state that in-line with emerging water efficient W.C.'s - reduced and dual flush cisterns - must accompany a new pan. Second question: Is it to be assumed that the technology in the ' pan ' has improved to suit the ' reduced water flush ' - and if so where is the literature supporting this?

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2 Comments

  1. Dear Patrick,
    The real question to ask is, the water with wich we fill the CCD's does it have to be a clean water? What is we re_use our used water in dishwashers, laundry washers to clean our toilets...all that we need is a filtration system.

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  2. Dear Patrick,
    What you decribed was 10 years ago part of the 50 tricks proposed by Nicolas Hulot to save the planet. Since people used bricks or bottled of filled water which were not very user friendly, this company invented this system, sold at € 4.90 on the net:
    http://www.toutallantvert.com/economiseur-deau-pour-chasse-deau-p-2147.html?cPath=26_106_198
    It is admitted that each European consumes roughly 150l of potable water per day, of which 30l are concerned by flushing toilets.
    The link says that their system could help saving 22 m3 of water and 17 kg CO2 per year per toilet system, this corresponding to an economy on water of approx. € 30.00 per year for € 4.90 spent. Pretty good deal.
    Hoping it helped,
    Cheers,
    LS