Hippo 9 Water Cistern Bag Heavy-Duty Water-Saving Flush Displacement Device

Cut UK utility bills and maximise water conservation in standard and high-capacity cisterns. Toilets are responsible for around 30% of average daily water use in homes, offices, schools, and commercial facilities across the UK. The Hippo 9 Water Cistern Bag (blue edition) is designed specifically for larger, traditional 9-litre cisterns to deliver maximum water savings per flush without requiring plumbing modifications. By displacing and retaining up to 3 litres of water on every cycle, the Hippo 9 reduces total flush volume while maintaining complete clearing pressure. For homes on water meters and facilities looking to lower operational overheads and hit ESG sustainability targets, the Hippo 9 delivers immediate, measurable cost reductions. Key Features & Benefits Maximum Water Savings: Retains up to 3 litres per flush—ideal for standard 9-litre single-flush lever toilets. Direct Utility Bill Reduction: Lowers both incoming metered water charges and outgoing sewerage fees for UK households and commercial properties. Tool-Free 60-Second Install: Simply expand into a box shape and place inside the cistern beneath the float valve—no plumber needed. Water Circulation Valve: Built-in relief holes allow fresh water to slowly circulate, preventing stagnation inside the bag. UK-Made & Accredited: Endorsed by Waterwise and manufactured in the UK from durable, fully recyclable polyethylene. Product Specifications Specification Details Model Hippo 9 (High-Capacity Saver) Material Heavy-duty recyclable Polyethylene Cistern Compatibility Large/standard 9-litre lever cisterns (Not suitable for slimline or post-2001 dual-flush push-button toilets) Water Reduction Up to 3 Litres retained per flush Certifications Waterwise Recommended Country of Origin United Kingdom Simple 3-Step Installation Shape: Remove the cistern lid and pop open the sides of the Hippo 9 bag until it forms a box shape. Position: Lower the bag into the cistern, positioning it directly underneath the float valve / ball cock assembly. Save: Replace the lid. The bag fills automatically with water, holding back up to 3 litres on every subsequent flush.