Wizso vs Cistern Bags: Smarter Toilet Water Saving for UK Homes

Toilet flushing is one of the biggest hidden water users in UK households. In fact, toilet flushing accounts for up to 30% of UK household water consumption. With rising water bills and growing environmental concerns, more homeowners are searching for effective toilet water saving devices - but not all solutions deliver the same results. 

Two popular options are cistern bags and Wizso. While both aim to reduce water use, the way they work - and the impact they have - is very different. 

What Are Cistern Bags? 

Cistern bags (also known as toilet tank water displacement bags) are a traditional water saving toilet solution. 

They are: 

When Are Cistern Bags Suitable? 

Cistern bags are typically: 

They are low-cost and simple to install, which is why they are often one of the first toilet water saving devices people try. 

The Limitations of Cistern Bags 

While cistern bags reduce water per flush, they do not reduce how often you flush. 

Key drawbacks of cistern bags include: 

Every flush still uses treated drinking water. The treatment and pipeline network required to deliver water to UK homes consumes significant energy, adding a hidden carbon cost to every flush. 

Wizso: Rethinking Toilet Water Saving 

Wizso approaches toilet water saving differently. Instead of reducing water per flush, Wizso reduces the number of flushes needed. 

Wizso works on a simple, proven principle: 

“If it’s yellow, let it mellow. If it’s brown, flush it down.” 

By keeping toilets clean and fresh between flushes, Wizso removes the need to flush after every number one - without compromising hygiene. 

Wizso Is Suitable for All Toilets That Use Water 

Unlike many traditional toilet water saving devices, Wizso is suitable for all toilets that use water. 

Because Wizso does not rely on modifying the cistern or changing flush volume, it works with: 

Cistern bags are limited by toilet type and are not compatible with dual flush systems. Wizso avoids these restrictions entirely, making it a universal water saving toilet solution for UK homes. 

Why Wizso Outperforms Cistern Bags 

1. Wizso Saves More Water Per Day 

Older toilets can use up to 13 litres per flush. Every flush avoided saves 100% of that water, not just 1–2 litres. 

With Wizso, each person can save 3–4 flushes per day, leading to substantial water savings across a household. 

2. Lower Carbon Impact 

Reducing flushing reduces: 

Wizso delivers water savings and meaningful carbon reduction. 

3. Real Household Savings 

Fewer flushes mean: 

These savings add up quickly, especially in family homes. 

Smarter Toilet Water Saving for the Future 

Cistern bags were an early step toward water efficiency, but modern households need smarter solutions. Wizso goes beyond traditional toilet water saving devices by reducing unnecessary flushing altogether.