What is a defining characteristic of pressure filters compared to rapid sand filters?

Pressure filters are designed to operate under pressurized conditions, allowing them to effectively treat water at higher rates and with more controlled filtration processes compared to rapid sand filters. The defining characteristic of pressure filters is that they can handle incoming water pressurized up to 25 feet of gauge pressure. This pressurization allows for compact designs and the ability to operate at greater depths, making them suitable for applications where space is limited or higher flow rates are required.

In contrast, rapid sand filters typically rely on gravity to move water through the filter media, which results in larger installations and a different operational mechanism. They do not operate under pressurized conditions, which is a key distinction between the two types of filtration systems. This ability to function under pressure makes pressure filters advantageous in certain situations, enhancing their utility in various water treatment scenarios.