Mention a large scale use of the phenomenona of reverse osmosis.

Explanation

**Step-by-Step Solution:**

1. **Understanding Reverse Osmosis:**
- Reverse osmosis is a process where solvent molecules (usually water) move from a less concentrated solution to a more concentrated solution through a semipermeable membrane when pressure is applied. This is the opposite of the natural osmotic process.

2. **Mechanism of Reverse Osmosis:**
- In reverse osmosis, a semipermeable membrane allows only certain molecules (like water) to pass through while blocking others (like salts and impurities). When pressure is applied to the concentrated solution (e.g., seawater), water molecules are forced through the membrane, leaving behind the dissolved salts and impurities.

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