Liquid Shampoo Is 80% Water — Here’s Why That Matters

Liquid Shampoo Is 80% Water — Here’s Why That Matters

Liquid Shampoo Is 80% Water — Here’s Why That Matters

Walk into any supermarket or pharmacy and you’ll see shelves lined with liquid shampoo.

Different colours. Different promises. Different hair types.

But most of them have one thing in common:

They’re made up of around 70–80% water.

And yet we rarely think about that.

We pick up the bottle, check the scent, maybe glance at the price — and into the basket it goes.

This isn’t a post about liquid shampoo being “bad.”
And it’s not about guilt.

It’s about understanding what you’re actually buying — and why that matters more than you might think.

What Does “80% Water” Actually Mean?

Water is usually the first ingredient listed on a liquid shampoo bottle (often written as aqua).

That means it’s the highest percentage ingredient in the formula.

The rest typically includes:

  • Cleansing agents (surfactants)

  • Conditioning ingredients

  • Fragrance

  • Thickeners

  • Stabilisers

The water acts as a carrier. It gives the shampoo its familiar texture. It allows it to pour easily from a bottle. It creates the consistency we associate with “normal” shampoo.

There’s nothing inherently wrong with water.

But when a product is mostly water, it changes the equation in ways most of us never stop to consider.

You’re Shipping Water

Water is heavy.

A standard 250ml bottle of shampoo weighs mostly what?
Water.

Now multiply that by:

  • Thousands of units per shipment

  • Pallets in warehouses

  • Delivery trucks

  • Shipping containers crossing oceans

When we buy liquid shampoo, we’re not just buying ingredients that clean our hair.

We’re transporting water around the planet.

And because water makes the product bulky and heavy, it requires:

  • More fuel to transport

  • More storage space

  • Larger packaging

When you remove water from the formula — as in a solid shampoo bar — you dramatically reduce shipping weight and volume.

It’s not dramatic. It’s not revolutionary.

It’s just physics.

Less water = less weight.
Less weight = less fuel.

Simple.

Plastic: A Direct Consequence of Dilution

Liquid shampoo requires a container strong enough to hold… liquid.

That means:

  • A plastic bottle

  • A cap

  • Often a pump

  • Labels

  • Seals

Even when recyclable, plastic still has a production footprint. It still requires energy to manufacture. And not all of it actually gets recycled.

Solid shampoo bars don’t need that structure.

When there’s no liquid to contain, packaging can be:

  • Paper-based

  • Compostable

  • Minimal

Again, this isn’t about perfection.

It’s about removing what isn’t necessary.

When you take water out of the product, you reduce the need for bulky plastic packaging.

And when you zoom out across millions of units?
That difference becomes significant.

Concentration: The Part No One Talks About

Here’s where it becomes personal — not environmental.

When a product is 80% water, only about 20% (give or take) is doing the actual cleansing and conditioning work.

That means every time you squeeze shampoo into your hand, you’re using:

  • A diluted formula

  • That’s designed to feel substantial

  • But is mostly carrier

Solid shampoo bars remove the dilution.

They are concentrated by nature.

You activate them with the water already in your shower.

That means:

  • You use less per wash

  • You’re applying a higher concentration of active ingredients

  • The bar lasts significantly longer

Many well-formulated shampoo bars last the equivalent of 2–3 bottles of liquid shampoo, depending on hair length and usage.

Which brings us to something interesting…

Cost Per Wash (The Comparison That Changes Everything)

At first glance, shampoo bars can look more expensive.

You might see:

  • Liquid shampoo: £4–£8

  • Shampoo bar: £9–£14

And assume the bottle is the better deal.

But that comparison is misleading.

Because what matters isn’t the upfront price.

It’s cost per wash.

Let’s break it down conceptually:

A typical 250ml liquid shampoo:

  • ~80% water

  • Lasts X number of washes

  • Requires more product per use because it’s diluted

A concentrated shampoo bar:

  • No added water

  • Activated in the shower

  • Often lasts 2–3 times longer

When you divide price by number of washes, bars frequently come out equal — or cheaper.

You’re not paying for water weight.
You’re paying for performance.

The Psychology of Liquid

So why did we all move toward liquid shampoo in the first place?

Because liquid feels familiar.

It feels:

  • Luxurious

  • Easy

  • Modern

Foam equals “clean” in our minds.
Squeeze bottles feel convenient.

Over time, that became the standard — even if it wasn’t the most efficient format.

And once plastic became cheap and widely available, it was easier to keep adding water and packaging rather than question the model.

“But Isn’t Water Already in the Shower?”

Exactly.

This is one of the most practical parts of the conversation.

You don’t need to buy water inside your shampoo — because you already have water coming out of your shower.

Shampoo bars simply remove the pre-added water and let you add it at the point of use.

It’s more efficient.

It’s more concentrated.

And it makes logistical sense.

This Isn’t About Throwing Everything Away

If you currently use liquid shampoo, this isn’t a call to throw it in the bin.

Use what you have.

But when it runs out?

It’s worth pausing.

Because once you realise you’ve been buying mostly water wrapped in plastic, it’s hard to unsee it.

And small switches — repeated over time — add up.

Why This Matters Beyond the Environment

Yes, there’s an environmental benefit.

Less shipping weight.
Less plastic.
Less unnecessary bulk.

But there’s also something else.

Clarity.

When you remove what’s unnecessary from a product, you’re left with something more intentional.

More concentrated.

More efficient.

And for many people, that translates to:

  • Better value

  • Simpler routines

  • Less clutter in the shower

It’s not about extremes.
It’s about reducing what doesn’t need to be there.

We Started in a Stable

At Janni Bars, we started in a stable.

Before we ever made personal care for people, we were making shampoo bars for horses.

It wasn’t about trends.

It was about practicality.

Bars made sense:

  • Easier to transport

  • No bulky bottles in tack rooms

  • Highly concentrated

  • Less waste

When we shifted into personal care, the logic stayed the same.

Efficiency isn’t a marketing angle for us.

It’s the foundation.

The Real Question

The next time you pick up a bottle of shampoo, you might ask:

Am I buying performance?
Or am I buying water in plastic?

Because once you understand the format, the choice becomes clearer.

Liquid shampoo isn’t evil.

It’s just inefficient.

And sometimes sustainability isn’t about adding something new.

It’s about removing what was never necessary in the first place.

Back to blog