Uniform flow distribution is the key to successful air + water backwash The underdrain is the heart of every granular media filter. Flexscour® filter underdrains provide a durable, corrosion-resistant system for collecting filtered effluent and accurately metering uniform air + water backwash flows. Innovative design features eliminate several key flow problems that have plagued other combined air + water cleaning systems: improper sizing of variable diameter orifices, and media displacement by surging or irregular flows through the laterals. Flexscour® underdrains feature lateral ducts constructed of stainless steel, axially partitioned into upper and lower channels for air and water. Typically, air is supplied from an overhead steel pipe while filtrate and backwash water flow through a concrete gullet floor channel and primary orifices in lateral baseplates. A variety of feed and drainage arrangements are possible, depending on existing basin layout and piping. All distribution orifices are precisely sized for each application to ensure flow equalization. The entire assembly is fastened to the filter floor with stainless steel anchor bolts.

Features & Advantages include:

• Corrosion-Resistant Stainless Steel
• Highly Uniform Flow Distribution
• Reduced Wash Water Use
• No False Floor Required
• Very Low Vertical Profile
• Ideal for Retrofit Applications
• No Gravel Layer Required
• 100% Stainless Steel Construction

info.ewt@glv.com