Crystal water tablets for aquariums are designed to improve water clarity by removing impurities and particles that cause cloudiness. These tablets typically work by binding to suspended particles, such as organic waste, uneaten fish food, and other debris, and causing them to clump together, making it easier for the aquarium filter to remove them.

Here are some common features and benefits of crystal water tablets for aquariums:

1. Water Clarity: Crystal water tablets help to clear cloudy water, resulting in a cleaner and more visually appealing aquarium environment.

2. Easy to Use: These tablets are usually easy to use, requiring you to simply add them to the aquarium water according to the manufacturer's instructions.

3. Safe for Fish and Plants: Most crystal water tablets are formulated to be safe for fish, plants, and other aquatic inhabitants when used as directed. However, it's essential to follow dosing instructions carefully to avoid any adverse effects.

4. Removes Organic Waste: Crystal water tablets can effectively remove organic waste, including fish waste, uneaten food, and other debris, which helps maintain water quality and reduce the risk of harmful ammonia and nitrite buildup.

5. Compatible with Filtration Systems: These tablets are typically compatible with various types of aquarium filtration systems, including mechanical, biological, and chemical filtration.