Horizontal dead end

The horizontal dead-end concept features a wide range of standardized skids with GRP membrane housings. This unique and robust concept provides maximum membrane footprint utilization and allows operating pressures up to 8 barg. This enables inline operation and direct coupling with a downstream reverse osmosis (RO) system without an intermediate break tank.



  • Highest membrane area-to-footprint ratio in the market
  • Up to four membrane modules can be placed in one GRP housing
  • Operating pressure up to 8 barg
  • Suitable for inline operation
  • High reference base, used in multiple large ultrafiltration (UF) plants around the world
  • Direct filtration of all water sources
  • Works with multiple X-Flow membrane modules Xiga and Seaguard

typical use

The horizontal dead-end skids have been a reliable and cost effective solution. Up to 4 ultrafiltration (UF) modules can be placed in one GRP housing. The largest horizontal dead-end skid has 4 columns of GRP housings which are stacked 12 housings high, holding 192 membrane modules in total. This incredibly compact design delivers a huge membrane area per square meter of floor space. In fact, the horizontal dead-end concept provides the highest membrane area-to-footprint ratio in the market. Although horizontal dead-end skids are mainly used in big projects (> 10 MLD), the concept is also suitable for smaller plants. The smallest horizontal dead-end skid has 2 columns with 6 GRP housings, holding 48 membrane modules.

Since the UF membrane modules are positioned inside GRP housings, the operational pressure can be up to 8 barg. This allows for inline operation and direct coupling with a downstream reverse osmosis (RO) system without intermediate break tank. Inline design reduces capital expenses, as feed pumps, cartridge filters and a break tank can be omitted. 

The horizontal dead-end skid can handle feedwater up to 30 NTU and turn it into an excellent water quality that can be used in, for example, RO processes. The horizontal dead-end skid and UF membrane modules have all major drinking water certifications.


With carefully selected partners, Pentair develops innovative and ready-to-use membrane installations that meet both regulatory and financial KPIs. The Pentair scope consists of the modular horizontal dead-end skid concept, X-Flow membranes, engineering, commissioning and process optimization.
As one of the world’s foremost membrane technology knowledge centers, we share our scientific know-how and practical experience with our partners to make the difference in challenging filtration projects. 

Our unique services during start-up and commissioning ensure a properly functioning membrane solution that will beat expectations.

Fields of application

The horizontal dead-end is developed for the treatment of surface water (to produce potable water or process water) and drinking water. It it also applicable for wastewater polishing and reuse. As pretreatment for seawater RO, it has a very impressive reference base.
The horizontal dead-end skids are also applied in industries such as Oil & Gas (injection water production).

It is the industries’ technology of choice when it comes to potable water, process water or polishing applications.
Based on your feedwater characteristics and flow requirements, our specialist can determine the optimum solution for your specific challenge.

Featured cases

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Minneapolis, US

Potable water production

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Clay Lane, United Kingdom

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gothenburg, sweden

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Inverness slider image

Inverness, Scotland, United Kingdom

Surface water

Shuwaikh slider image

Shuwaikh, Kuwait


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wakefield, united kingdom

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