Permutit® Automatic Valveless Gravity Filters - AVGF

Automatic Valveless Gravity Filters (AVGF) operate automatically without a single valve, backwash pump, flow control or other instrumentation. Nothing moves but the water.

Permutit 12 ft. Diameter AVGF Filters

You must be interested in our Permutit® Automatic Valveless Gravity Filters (AVGF), which are now part of the Siemens' family of companies. Known for dependability and long-term operation, Permutit® AVGF’s have been installed in many applications worldwide. AVGF’s operate automatically without a single valve, backwash pump, flow control or other instrumentation. Nothing moves but the water.

The design and performance of the AVGF have been proven through years of continuous use at hundreds of water treatment facilities worldwide. Widely used in pretreatment plants for boiler feedwater, generating stations, pulp and paper mills and chemical plants, the AVGF is also approved by a majority of states for treatment of potable water supplies.

top of page

Features and Benefits

AVGF's are commonly used for process water, potable water, oxidized iron removal and cooling tower side stream applications. Standard filter sand or anthracite is generally used as the filter media. Some of the benefits include:

Requires little to no labor or maintenance; the AVGF operates by itself – it filters, backwashes, rinses and returns to service without the use of valves, timers or switches. Click on this link to see an animation showing how the AVGF operates.
Requires no electricity and it is ideal for applications where electricity is not available or where electricity is expensive and is especially useful in developing nations
A unique design, including the discharge of filtered water above the filter bed, which results in consistent high-quality effluent water
Does not discharge water to drain, instead it is stored and used for the next backwash cycle to save water

top of page