What Name Is Given to the Process by Which Water Moves Across a Membrane?

Water is the cornerstone of life. From how plants drink to how our kidneys filter blood, water’s movement across membranes plays a vital role in biological and environmental processes. But have you ever wondered what this process is actually called?

The answer: osmosis.

In this blog, we’ll explore the fascinating science behind osmosis, explain its significance, and delve into how this principle is used in modern water filtration systems—especially in reverse osmosis, the tech behind some of the best water purification systems available in the UK. We’ll also highlight why the Waterdrop Reverse Osmosis System is one of the top choices for UK households seeking safer, cleaner water.

Osmosis is the process by which water molecules move across a semipermeable membrane from an area of low solute concentration (more water) to an area of high solute concentration (less water). This movement continues until there’s a balance in concentration on both sides of the membrane.

This natural process is vital in living organisms and occurs in cells throughout the human body. It’s how plants absorb water from soil and how kidneys filter waste. Simply put, osmosis helps keep things in balance.

A semipermeable membrane acts as a selective barrier—allowing some molecules, like water, to pass through while blocking others such as salts or larger particles. In biology, this membrane is typically a cell wall or membrane, but in water purification, it’s a synthetic layer designed to allow only pure water molecules through.

Now that you know what osmosis is, let’s look at reverse osmosis (RO)—the advanced version used in home water filtration systems.

Reverse osmosis is a process where pressure is applied to push water through a semipermeable membrane in the opposite direction of natural osmosis. In this way, contaminants like chlorine, lead, limescale, and bacteria are left behind, producing clean, safe, and great-tasting water.

1. Pre-Filtration : Sediment and carbon filters remove large particles, chlorine, and odours.

2. RO Membrane : The heart of the system, filtering out microscopic contaminants.

3. Post-Filtration : A final polish that improves taste and ensures safety.

4. Storage or Direct Dispensing : Clean water is stored or directly dispensed from a tap.

You might think water in the UK is perfectly clean straight from the tap—and while it is generally safe to drink, that doesn’t mean it’s free from contaminants, chlorine, microplastics, or heavy metals that can affect your health and taste.

According to Drinking Water Inspectorate data, some areas still face issues with trace metals, nitrate content, and lead in plumbing systems. Water filters with reverse osmosis technology offer a proven way to reduce these risks.

Installing a reverse osmosis system is a game-changer for any UK household, especially if you live in a hard water area or have older plumbing that might contain lead. Benefits include:

• Clean, safe drinking water
• Removal of over 95% of contaminants
• Improved taste and smell of water
• Better water for cooking, kettles, and baby formula
• A more sustainable alternative to bottled water

One of the top-rated systems for British homes is the Waterdrop Reverse Osmosis System, known for its space-saving tankless design, smart technology, and high filtration accuracy.

Easily monitor water quality in real time with the built-in digital display on the tap—so you always know you’re drinking the best.

Perfect for under-sink areas in UK kitchens, saving valuable space and eliminating the risk of secondary pollution associated with water tanks.

Fully compatible with UK plumbing and water pressure standards. You can install it yourself in under an hour, thanks to its straightforward design.

With a low drain ratio and energy-efficient technology, Waterdrop reduces water waste—making it a sustainable choice for your home.

If you’re still deciding whether a reverse osmosis system is right for you, here are some things to consider:

As you can see, the Waterdrop RO System outperforms many alternatives, especially when it comes to removing harmful substances and improving taste.

To recap:

• Osmosis is the natural movement of water across a membrane to balance concentrations.
• Reverse osmosis uses pressure to filter out contaminants from water.
• The Waterdrop Reverse Osmosis System is an ideal solution for UK households looking for safe, clean, and tasty water straight from the tap.

By understanding how osmosis works, you can make smarter decisions about your home’s water filtration—and enjoy the benefits of truly purified water.