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PESU Selected for Ultrafiltration Membranes by Water Treatment Company

Pentair opted to use BASF’s Ultrason PESU to ensure the delivery of clean and safe water.


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Ultrason E 6010 P  polyethersulfone (PESU) from BASF was selected by London-based water treatment company Pentair to produce ultrafiltration (UF) membranes for the purification and decontamination of drinking water. Pentair now employs the high-purity PESU for a wide range of X-Flow water treatment applications covering the whole water distribution line from upstream to downstream, especially for at-the-source membranes in water distribution systems of public buildings as well as in point-of-use filters for infection control in hospitals.

In contrast to other materials commonly used for UF membranes like polyvinylidene difluoride (PVDF), Ultrason E shows the unique combination of a high flux of water and a narrow pore size distribution. This enables UF membranes which can reliably remove parasites, bacteria and even viruses to meet drinking water standards without the need to additionally super-chlorinate the drinking water after filtration.

According to Pentair X-Flow membranes made from Ultrason E help to avoid possible contamination of pathogenic waterborne bacteria such as legionella and pseudomonas in the water pipes, which can lead to serious health issues for the occupants. With Ultrason E as base material, a narrow pore size distribution in UF membranes can be achieved. The membranes enable the high throughput production of clean and safe potable water, free of bacteria and fungi, at low pressure in a very efficient way. Other water treatment systems such as reverse osmosis (RO) systems as well as boilers, ice machines and water coolers benefit from a better water quality.

The BASF PESU can also be employed in point-of-use filtration for easy and reliable protection against waterborne bacteria at the last possible moment before human contact. The unique filters for shower heads, taps and faucets are especially designed for hospitality and medical facilities, also for high-risk areas like critical wards, intensive care units or operating rooms. They consist of hollow-fiber UF membranes with microscopic pores made of Ultrason E. The pores reportedly form a very fine filter that reliably retains bacteria or fungi and thus offer protection from waterborne infection. Despite this high filtration efficiency Ultrason E allows for membranes with very high productivity, i.e. high water flux.