This needs a Premium subscription

Your plan covers Filter Sizing, Media & Support, Hydraulics, Schematic and Backwashing. Premium adds:

• Peripherals — underdrain floor and nozzle density, the support gravel decision, backwash and air pipework velocities, and launder hydraulics
• Air Blower — air-scour blower discharge pressure, air mass flow, discharge temperature and shaft power
• Report & Save — PDF report, CSV export and a design file you can load again