NX Filtration’s membrane technology is development of Hollow Fiber Nanofiltration (HFNF) that is capable of selectively removing organics from polluted water, including micropollutants, color, antibiotics, bacteria, and viruses. This has resulted in new and simple applications in the treatment of colored water, the reuse of waste water and the production of potable water.
NXF MexFilTM hollow fiber membranes are used in water, wastewater, and process applications. Membranes are operated in an inside to outside mode. The base chemistry of the membranes is a modified polyethersulfone (PES). Compared to other membrane materials PES enable the production of membranes with very small pore sizes and narrow pore size distribution. In addition, it provides outstanding properties with respect to thermal and chemical resistance.
Add (Picture 0 – Layer by layer Hollow Fiber dNF Membranes)
Add (Picture 1 – Product Range and Application)
Add (Picture 2 – dNF and UF Membrane Summary)

FEATURES
a. Ultra-thin selective nano-scale layers on chemically resistant Polyethersulphone (PES) support
b. PES Hollow Fiber geometry :
1. High fouling tolerance, no pre-treatment required
2. Chemical stability : Chlorine tolerant, pH 1-14
3. Backwashable
c. TSS, Bacteria, Virus, Organics (Micro Pollutant) and Salt Removal
d. Simple one step water filtration processes with small foot print
e. Excellent solution for Decentralized Water Treatment
f. Simple System Integrity measurement
g. No Chemicals = No sludge production and simple brine discharge
h. Limited pre-treatment required, no coagulation and no sludge production
i. Recovery production < 85% Add (Picture 3 – Step Water Filtration) PRINCIPLE OF OPERATION NX FILTRATION The Nanofiltration membranes are manufactured using the so called "layer-by-layer" process, where multiple nano-scale layers are deposited on a membrane support. The number of nano layers determines the rejection and flux properties of the membrane. The HFNF membranes capable in blocking all kinds of micro-pollutants and easier to clean. A unique solution for troubled water, especially colored water and wastewater. COMPARISON TECHNOLOGY OF WATER TREATMENT Add (Picture 4 – Comparison Technology) PROJECT IN PHILLIPINES REFERENCES PROJECT Add (Picture 10 – References Project)

Add (Video – Tetra De Nora)
The TETRA™ LP Block™ dual parallel lateral underdrain from De Nora is a provendesign of filter underdrain offering superior distribution of both backwash air and water, either sequentially or concurrently. The system is NSF61 and UK Secretary of State approved and also has certification for use with drinking water applications in other countries.
Effective media cleaning is the key requirement for a filter to function efficiently under all loading conditions. Backwashing gravity filters is necessary to remove the solids collected by the media during the filtration run. In the TETRA™ LP Block™ underdrain, air and/or water is distributed evenly across the entire filter bottom during the backwash cycle to effectively remove and release solids from the filter. The use of concurrent or sequential air and water significantly reduces the volume of dirty backwash water produced and drastically lowers operating costs through the uniform backwash process.
The TETRA™ LP Block™ underdrain ensures lower operating costs and effective backwash distribution that can improve run times.
Add (Picture 0 – Comparison Nozzle and Underdrain)
Add (Picture 1 – Tetra LP Block)

THE TETRATM LP BLOCKTM DESIGN
The TETRA™ LP Block™ underdrain features the unique and patented (U.S. Patent Number 8,343,343) Anchor-Rite® and (U.S. Patent Number 6,110,366) GroutGrip™ design. The GroutGripincreases resistance to uplift from the filter floor and the Anchor-Rite® fastens the block to the floor. The LP Block™ with GroutGrip includes six rows of integrally molded dovetail wedges that become embedded in the floor grout, offering 1.75 times the pullout strength of a conventional underdrain block. The LP Block™ with Anchor-Rite® is bolted to the filter floor to prevent buoyancy. GroutGrip is integral to the block; the Anchor-Rite® is optional.
Add (Picture 2 – Tetra LP Block Design)

THE TETRATM LP BLOCKTM FEATURES AND BENEFITS
a. Features
• Lightweight and robust design
• No moving or wearing part
• Low profile
• GroutGrip™ design
• Anchor-Rite® design
• Media retention plate

b. Benefits
• Excellent distribution of backwash air / water – more efficient bed cleaning and reduced filter operating costs
• Wide profile design means approximately 1/3 less laterals and thus fewer joints and grout are required and reduced installation costs
• Easy maintenance, long life, and simple installation
• Easy retrofit of existing shallow filters with air/water backwash and/or greater media depth
• GroutGrip design offers increased adhesion to filter floor
• Anchor-Rite® designs offer buoyancy prevention
• Easy to install in retrofit applications
• Dual air/water backwash uses significantly less water than water alone
• Media retention plate prevents media from entering the block and also simplifies media replacement
• Low profile reduces the filter box depth for added savings on new construction
Add (Picture 3 – Tetra LP Block)
Add (Picture 4 – Tetra LP Block Installation)

THE TETRATM LP BLOCKTM TECHNICAL DATA
Add (Picture 5 – Tetra LP Block)
Add (Picture 6 – Tetra LP Block Specification)

PRINCIPAL OF OPERATION TETRA LP BLOCK
TheTETRA™LPBlock™underdrainprovides animproved distributionofbackwashwater tothefiltermedia through theuseofdualcompensatinglaterals. Backwashwater enters theprimary lateralsand then passesthroughthe controlorificesintothesecondarylaterals.
Backwashairisproperlydistributedbythecarefuldesign oftheuppercontrolorificesbetween theprimary andsecondarylaterals, providingevenairdistribution.
Media retention on plates maximize the available filter tank depth. Careful quality control and testing during the plate manufacturing process is used to ensure that the media retention plates prohibit media pass through and provide proper flow characteristics. De Nor should be consulted on the use of media retention plates when lime softening or alum coagulant are used upstream as these are known to potentially plug the plates.
Add (Picture 7 – Tetra LP Block Arrangement)

MEDIA RETENTION PLATES
Add (Picture 8 – Media Retention Plates)
TETRA™LPBlock™underdrainsareavailablewithmedia retention plates topreventmedia lossthroughthefilter floorand alsoincrease theavailablefilterheadroom. Themedia retentionplate replaces conventionalgraded gravellayers. The S Plate is manufactured of precisely sized and carefully sintered HDPE beads that ensure even distribution of backwash air and water for increased run times and lower operating costs.
1. Features of Media Retention Plates
• Lightweightandrobust design
• 19mm(3/4″) platereplaces 300mm(12″)typical graveldepth
• Compatible withWaterTreatmentChemicals
• Factorytested(<125 mmwgloss@70m/h) (5"WCloss@41cfm/sf),sealedandmounted 2. Benefits of Media Retention Plates • Easytoinstallandremovable • Reducesdepthrequirementformedia,whichis particularly beneficialforshallowfilters • Providesuniform flowdistribution ataheadlosssimilar to300mm(12")graveldepth • Retainsmedia downto450micron (0.45 mm) particle size • Doesnotleachchemicals intothedrinking watersupply • Mediaretentionplatepreventsmedia loss through the filter, and also simplifies media replacement Add (Picture 9 – Media Retention Plates) Add (Picture 10 – Media Retention Plates) REFERENCES PROJECTS Add (Picture 11 – References Projects)

Davey has been manufacturing products that help protect and enhance people’s lives. Whether you need perfect pressure, healthy drinking water, protection from fire and flood, a clean, relaxing pool or spa, or water to run your farm or business, you can depend on Davey.
Traditionally servicing the domestic water pumping, water treatment and swimming pool & spa markets, Davey has in recent years expanded its focus and product portfolio to include the commercial pumping, irrigation and commercial pool markets. Backed by specialists in our commercial team, we can also design customised systems to suit project requirements.
Davey works to Lean practices, is an ISO 9001 Quality Endorsed Company and been certified to ISO 14001 for our Environmental Management System.
Davey’s pumps have been proven to perform well in some of the world’s harshest climates, in our manufacturing we replicate these conditions in our environmental cabinet, where our pumps are run for months at a time at 50°C and 100% humidity

PRODUCTS LINE
a. Home and Garden
Constant flow and even pressure around the home is important! Prevent fluctuations in water temperature during showers, get strong pressure from the start as well as even flow. Whether you need perfect drinking water, a steamy or strong shower, or just to have water to boil the kettle, Davey has a product to suit.

• Home Pressure
Consistent and reliable water pressure is the goal for every home – whether you want a great shower with constant pressure, water on tap – ready for washing up, laundry or hosing the garden – Davey has a product to suit its home pressure range. Davey’s extensive range include control options to suit your needs :
1. Davey DynaDrive variable speed systems for strong even pressures and super quiet operation
2. The integrated intelligent Torrium2 controller available on a board range of horizontal multistage and jet assisted pump models ensures constant flow and even water pressure
3. For off-grid or remote applications some customers prefer the established option of pressure switch and tank-Davey offer models specially designed for this as well
Davey water pressure systems have been extensively standards tested, and are certified as AS/NZS4020 (drinking water safe) compliant

b. Farm and Irrigation
Solutions to help you with lifting, treating, storing and transferring of water right across all of your Farm & Irrigation needs.
On your farm you can get water from a variety of sources, including dams, bores, wells, rivers, channels, town supply or other sources. You might even consider recycled water for uses such as washdown of animal housing areas, or perhaps feed pads. Davey has a variety of solutions to suit all applications.

• Irrigation
Davey can supply your pumping needs whether it’s an off the shelf pump or a purpose-built solution. Davey’s pump priority is to ensure irrigation working at peak performance. All of crops, pastures, golf courses, playing fields or even home gardens are an important part of your life and reliable pumping is critical to their survival. Davey makes it easy with dependable products coupled to smart products like and controllers for multi-pump boosters with fixed and variable speed, customizable control option, MonsoonIQ internet connected controllers, and many more.

• Washdown
The washdown of sheds and yards, standoff areas or feed pads is of utmost important for the health and well being of livestock. Whether you are using bore or surface water, recycled water or harvested storm water, the Davey’s washdown pumps have been used and proven around the world.

• Water Transfer
Davey have an extensive range of pumps suitable for all sorts of applications where water needs to be moved. Davey can help us do it quickly and reliably with our range of water transfer pumps and products, ensuring to get the best results.

• Water Transfer
Reliable effluent and/or wastewater management systems are of critical importance whether it’s around home, farm, or public and commercial environment. Davey have a broad range of both submersible and surface mount pumps able to be used from rainwater recovery through to raw sewage through to solids in suspension in slurries.
With products ready for use across a vast variety of application. Davey offer pumps in single or three phase, with and without automatic float switches, single and multi-pump controllers and protection systems, as well as a range of relevant accessories.

• Rainwater Bank
The Davey Rainbankcan save up to 40% of households mains water use, helping to conserve water, and lower water bills. Rainbank is an automatic controller for rainwater harvesting supplying water for toilet and laundry applications, automatically selecting the water source with rainwater given the priority over mains supply. Mains water is supplied when the tank is empty or in the event of a power aoutage

c. Pool
Davey is a global leader in pool and spa equipment, from pumps to salt water chlorinators, filters, accessories and controllers.For the perfect dip every time, pools should be healthy, fresh and sparkling. Whether your pool is large or small, make the right choice with a Davey product to fit your needs and budget.

• Pool Pumps
Davey has a pool pump to suit all pool sizes and types. Whether you are looking for fixed or variable speed, something to suit a small or large pool or a filtration or solar application. Davey has a pool pump suit!. In addition to pool pumps, Davey has a huge range of other pool products across filtration, sanitization, heating, cleaning, accessories, and spa products – so you can ensure your pool and spa environment is managed effectively across residental and commercial applications.

• Pool Filtration
No more green pools! For sparkling, clean, and dirt-free water make sure you have a Davey pool filter and media to match. Along with removal of dirt & bugs, proper filtration allows for better distribution of the various pool chemicals to combat bacteria, equalling no more green pools. Automatic suction cleaners also do a great job alongside your filtration equipment, to make your pool clean from leaf litter and grime that builds up.

• Pool Sanitization
Keeping your pool water balanced and sanitized is essential for the safety of your swimmers. The effective and convenient process of sanitization, based on on the electrolysis of common salt, is supported by Davey Chloromatic products, ensuring water that is crystal clear, pure and fresh – and ready to swim in.

• Accessories
Davey holds a range of quality pool accessories, including PAL lights to light up your life, cascading waterfalls to add a little something special to your pool. Whether you want to create a welcoming atmosphere, change the mood in a minute, or simply just change the look of your pool with colour easily and quickly – Davey has a product to meet ypur needs.