AirRex® is the first plastic piping assembly designed expressly for aeration service. It is available as a kit. The modular concept in combination with the revolutionary, patentpending, connection and the specially designed supports allow fast installations at low costs.

AirRex® can be retrofitted into basins equipped with fine bubble aeration to increase efficiency and yield a reasonable payback as well as older, coarse bubble installations. New installations will be the lowest cost high efficiency diffuser system available.

The AirRex® piping system is optionally equipped with a 3/4″NPT or BSP female thread. The OTT MAGNUM® tube and the OTT D-REX® disc diffuser as well as a disc diffuser from other manufacturers can be easily mounted on the D-REX® piping system by using adapters.

With only 3 different elements, AirRex® can be combined in lengths of about 1.8 meters (6 ft) for any basin configuration.

The AirRex® piping system is the first choice for operators, OEMs and engineers that demand high efficiency and quality at a lower cost than stainless steel piping. AirRex® systems rival the efficiency of strip or panel diffusers at a cost of lower density disc systems.

The AirRex® transition unit is available in DN 50-100 (2”-4”). This allows an easy integration in existing piping systems.

STANDARD2 diffusers are installed quickly and easily on rectangular headers with 40 or 45 mm (1.57“ or 1.77“) diameter outlet openings. They are installed in pairs using double-threaded connectors available in engineering plastic PP-GF, VA-grade stainless steel or brass.

STANDARD2 diffusers can also be installed on round headers with 20 mm (0.79“) diameter outlet openings. A saddle-contoured adapter ensures secure mounting. These rugged adapters provide reliable service at high operating temperatures along with outstanding resistance to formic acid.

STANDARD2 tube diffusers are available from stock in effective lengths of 500, 750 and 1000 mm (19.69“, 29.53“ and 39.37“). Custom lengths, e.g. for trailer-mounted treatment units or MBR modules, can be fabricated in exact accordance with your specifications.

MAGNUM® diffusers can be installed on rectangular or round headers with 30 mm or 38 mm (1.18“ or 1.50“) outlet openings. We offer connectors for DN 80, 100 and 125 mm (3.15“, 3.94“ and 4.92“) diameter round headers and 80, 100 and 120 mm (3.15“, 3.94“and 4.72“) rectangular headers.

We offer stainless-steel-free mounting hardware for installation on AirRex® headers. All mounting components are made from engineering resin PP-GF and therefore suited for operating temperatures up to 120°C (248°F) and fully resistant to formic acid.

MAGNUM® diffusers are available in lengths of 1200, 1700 and 2200 mm (47.24“, 66.93“ and 86.61“). Custom lengths in accordance with your exact specifications can be supplied on request.

D-REX® 9“ disc diffusers offer maximum performance and durability at an attractive price. D-REX® incorporates design features ensuring efficient and uniform aeration over a wide range of air througputs. Our premium membrane materials FLEXNORM® and FLEXLON® provide workhorse reliability even in demanding wastewaters. headers.

D-REX® disc diffusers can be installed on round or rectangular headers. Connector options are available for installation on ¾“ internal or external threading. D-REX® disc diffusers are 100% stainless-steel free for outstanding corrosion resistance. The customizable membrane perforation is engineered to provide a uniform and smooth bubble pattern over a broad range of air throughputs. Due to their outstanding efficiency, D-REX® 9“ disc diffusers can be used as a cost efficient 1-to-1 replacement of existing conventional 12“ disc diffusers

Customers use our diffuser membranes in highly diverse applications:

These include conventional municipal and industrial activated basins, MBR and fixed-bed systems and even fish farms. Accordingly, OTT disc membranes are available in two different customizable materials: EPDM (FLEXNORM®) and OTT proprietary elastomer (FLEXLON®).

FLEXLON® – for long disc diffuser service life

FLEXLON® membranes are recommended for use in aeration of industrial wastewaters and in processes with air temperatures up to 110°C (230°F). This proprietary OTT material shows outstanding resistance to oils and greases and provides smooth and reliable operation in industrial and municipal wastewaters.

FLEXNORM® – the bioresistant workhorse

FLEXNORM® formulated with a biologically resistant plasticizer which reduces shrinkage and age-related stiffening. Their high-quality formulation ensures long service life even at air temperatures up to 80°C (176°F).

FLEXSIL® – Efficient and Durable

FLEXSIL® membranes are recommended for use with challenging wastewaters as well as in aeration systems requiring high efficiency and long service life. FLEXSIL® membranes are suitable for applications at high submersion depths, in heavily polluted wastewaters and at compressed air temperatures up to 110°C (230°F). Made of plasticizer-free materials of construction, they are not subject to embrittlement and are fully resistant to bioslime, a wide range of chemicals as well as oils and greases.

FLEXNORM® – the bioresistant workhorse

FLEXNORM® membranes are recommended for aeration of municipal wastewaters. They are formulated with a biologically resistant plasticizer which reduces shrinkage and age-related stiffening. Their high-quality formulation ensures long service life even at air temperatures up to 80°C (176°F).

FLEXSIL® – efficient and durable

FLEXSIL® membranes are recommended for use with challenging wastewaters and in aeration systems designed for maximum efficiency and service life. They are well suited for applications in deep basins, with heavily polluted wastewaters and/or at temperatures up to 110°C (230°F). This membrane is not subject to age-related stiffening and exhibits outstanding chemical resistance to a wide range of chemicals, oils and greases.

FLEXSIL+® – the non-stick membrane

FLEXSIL+® membranes have the same excellent properties as FLEXSIL® membranes and in addition enhanced anti stick characteristics. The result: reduced fouling and encrustations, therefore minimizing pressure drop and maximizing efficiency.

FLEXLON® – for long disc diffuser service life

FLEXLON® membranes are recommended for use in aeration of industrial wastewaters and in processes with air temperatures up to 110°C (230°F). This proprietary OTT material shows outstanding resistance to oils and greases and provides smooth and reliable operation in industrial and municipal wastewaters.