A water ioniser is a device used to alter the pH level of water and separate it into alkaline and acidic water. It uses electrolysis technology to ionise the water and produce negatively and positively charged ions. The alkaline water is often used as drinking water and is said to have an alkalising effect on the body, while the acidic water can be used for cleaning purposes. Water ionisers aim to alkalise the water and potentially offer antioxidant properties.

On the other hand, an osmosis system is a system based on the principle of reverse osmosis, as described above. It uses a semi-permeable membrane to remove contaminants such as salts, minerals, heavy metals, bacteria and viruses from the water. The reverse osmosis process produces clean, filtered water that can be used for various purposes such as drinking, cooking or industrial applications. Osmosis systems aim to remove a wide range of contaminants from the water and ensure high water quality.

The main difference between a water ioniser and an osmosis system lies in how they work and their objectives. While a water ioniser mainly aims to change the pH level of the water and potentially provide alkaline water, an osmosis system focuses on removing impurities and providing clean, filtered water. The choice between the two depends on individual requirements and preferences, whether one prefers water ionisation or comprehensive purification.