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

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.