Which type of filter is known to have the total water production backwash usage not exceeding 6%?

High-rate filters are designed to operate efficiently while minimizing water loss during backwashing, which is the process of cleaning the filter media. The unique feature of high-rate filters is their ability to maintain effective filtration at a higher velocity, leading to a reduction in the amount of water needed for backwashing. The total water production backwash usage for these filters typically does not exceed 6%, making them a cost-effective option for water treatment facilities.

In contrast to high-rate filters, deep-bed filters, slow sand filters, and biological filters may require a larger volume of water for backwashing due to their operational characteristics and maintenance needs. This design consideration is crucial for optimizing water usage and ensuring sustainable practices in water treatment operations. Thus, the efficiency of high-rate filters in terms of backwash water usage highlights their advantage in preserving water resources while still providing high-quality filtration.