Which filtration method is specifically designed to physically remove particulate waste?

The correct choice focuses on mechanical filtration, which is specifically designed to physically remove particulate waste from water, such as uneaten food, fish waste, and debris. This method typically employs filter media, like foam or bag filters, that capture larger particles as water passes through them. Mechanical filtration is essential for maintaining water clarity and quality in aquatic systems, as it effectively reduces the accumulation of suspended solids.

Biological filtration, while crucial for breaking down harmful substances like ammonia and nitrites through the action of beneficial bacteria, does not directly address the physical particles in the water. On the other hand, chemical filtration involves using chemical agents to remove impurities, such as activated carbon absorbing toxins and odors but also without a primary focus on physical particulate removal. Therefore, mechanical filtration stands out as the dedicated process for the physical cleansing of water from visible debris and solid waste, making it the most relevant method for this function.