Did you know that toilets alone account for up to 30% of a household’s total water use?

What if you could cut that in half — without sacrificing flushing performance?

Here’s how:

Today, water fills your toilet cistern under mains pressure (typically 2.5 bar or more) but drains for flushing at atmospheric pressure — which is why traditional toilets need large volumes for a strong flush.

My idea uses a sealed expansion tank (like those found in heating systems) cleverly integrated inside the ceramic cistern. By compressing air during filling, the tank stores water under pressure — and releases it forcefully when you flush.
This allows you to maintain flushing power with up to 50% less water.

🌍 The Impact

• One person flushes ~16,000 liters of water per year.
• Cutting that by half saves 8,000 liters/year per person.
• For Ireland’s 5 million residents, that’s 40 billion liters saved annually — enough to fill over 16,000 Olympic swimming pools!

Even though domestic water is currently unmetered in Ireland, every liter saved reduces the burden on water treatment plants, energy use, and infrastructure maintenance.

✅ Simple, Scalable, Effective

• No electricity needed.
• Minimal modification — just a well-designed expansion tank fitted to standard cisterns.
• One-time setup adjusted to your home’s water pressure.

🤝 Ready to Collaborate

I’m looking for partners — from plumbing manufacturers to sustainability innovators — to bring this idea to life and make water-saving toilets the new standard.

Let’s connect if you’re interested in prototyping, manufacturing, or distributing this solution!