A Leopold filter bottom is a patented filter underdrain system using a series of perforated _______ with channels to carry the water.

A Leopold filter bottom is a patented filter underdrain system using a series of perforated _______ with channels to carry the water.

• A. PVDF Pipes
• B. CPVC Pipes
• C. Vitrified Clay Blocks
• D. Ceramic Diffusers

Answer: (C)

Leopold filter bottoms rely on an underdrain system built from perforated blocks that form a network of channels to carry the water to the drain. These blocks are made of vitrified clay, which is strong, durable, and chemically inert, so it holds up under backwash and pressure. Each block has perforations that allow water to pass from the filter media into the block’s hollow spaces, and when the blocks are set together, the voids line up to create continuous channels that collect the filtered water and deliver it to the underdrain header. This combination—perforations for water entry plus interconnected channels for collection—provides even distribution of flow across the filter bottom and reduces clogging. The other options describe different materials or components that don’t form the same integrated block-and-channel underdrain network.

Leopold filter bottoms rely on an underdrain system built from perforated blocks that form a network of channels to carry the water to the drain. These blocks are made of vitrified clay, which is strong, durable, and chemically inert, so it holds up under backwash and pressure. Each block has perforations that allow water to pass from the filter media into the block’s hollow spaces, and when the blocks are set together, the voids line up to create continuous channels that collect the filtered water and deliver it to the underdrain header. This combination—perforations for water entry plus interconnected channels for collection—provides even distribution of flow across the filter bottom and reduces clogging. The other options describe different materials or components that don’t form the same integrated block-and-channel underdrain network.