Media FiltersPressurized sand media filtration is the traditional and most common technology, yet significant knowledge and experience are required in order to provide highly efficient systems.The filtration experience gained at amiad allows us to approach this market with the ability to design, install and commission a wide range of complex systems.Filtration principlesFiltering with media filters is also recognized as depth filtration. The media filters perform the filtration of water through a thick layer of graded particles. These particles can be sand, gravel or other granular materials. The filtration rate depends on the effective size of the bedding and the water velocity through the filter. Amiad offers a complete line of manifolds, accessories and control systems for single or multiple media filters. The Amiad Customer Support Department is at your service in designing complete media filtration systems with gravel, sand, active carbon or multi-layer beddings: for manual or automatic operation, for single or multi-units, manifolded for complete filtration solutions. 

Plastic filtersAl-purpose plastic filters from 3/4" to 3", with filtration degrees from 3500 to 22 micron.High particle retention: Large filter area, allows long intervals between cleaning.Non-corrosive and durable: Engineered plastics; no metal parts in contact with water.Easy maintenance: The filter elements can be easily extracted from the filter housing for rinsing.Interchangeable filter element types and a wide range of filtration degrees to suit different requirements.Minimal energy loss: Extremely low head loss at high flow rates.Available also with the exclusive features of "Autoflush", "Brushaway" and "Scanaway" for semi-automatic cleaning.

Fast, Efficient Self-Cleaning Technology for Continuous Flow of Filtered Water

Automatic filtersReal-time self-cleaning filters: clean themselves automatically when head-loss across the screen reaches a preset valueUninterrupted water supply: the filter cleans itself in just seconds without interrupting downstream flowModular structure: different diameters, suitable For use singly or in manifold configuration providing optimal solutions Tomeet specific customer requirementsFlexibility of control options: Hydraulically or electronically controlled units. Electric control boards To suit specific needs.Flushing according To pressure differential and/oraccording To time. Continuous flushing, alarm signals, flushing counterand moreWide range of filtration degrees: from 3500 To 3 micron 

Filtering process:Water is filtered through the fine screen To the outlet. The filtrationcake is accumulated on the inner surface of the fine screencausing pressure differential To build up.Self-cleaning process:The M100 pistonless filters will start the self-cleaning processwhen the pressure differential across the screen reachesa preset level. The rinse controller opens the flushing valvecreating a strong backflush stream To atmosphere.This backflush creates a suction effect at the nozzles, cleaningthe face of the fine screen directly in front of the nozzle openings.Backflush water Then flows through a collector pipe via ahydraulic rotor To the flushing valve, causing the dirt collectorassembly To spin. Pressure drop in the rotor chamber forces thecollector assembly upward. The combined spin and upwardmovements ensure that the suction nozzles sweep the entirescreen area.When flushing is completed, a second flushing cycle is triggered,pushing the collector assembly downward To its original position.The combined flush cycle takes 6 - 10 seconds.1. Coarse & fine screens2. Outlet3. Rinse controller4. Flushing valve5. Nozzles6. Collector pipe7. Rotor8. Dirt collector assembly9. Rotor chamberPiston models M100-4500 , M100-6800Filtering process:Water is filtered through the inlet and is pre-filters through the coarse screen and Then filtered through the fine screen. From there it is passed Tothe outlet and as filtration cake is accumulated on the inner surface of the fine screen pressure differential builds up.Self-cleaning process:The M100 piston filters will start the self-cleaning process when the pressure differential across the screen reaches a preset level. At a preset level,the rinse controller opens the flushing valve creating a strong backflush stream through the drainage To the atmosphere. This backflush createsa suction effect at nozzles, cleaning the face of the fine screen directly in front of the nozzle openings.Backflush water now flows through collector pipe via hydraulic rotor To the flushing valve, causing the dirt collector assembly To spin.Pressure drop in the rotor assembly and drainage of the piston forces the collector assembly into axial movement. The combined spin andaxial movements ensure that the suction nozzles sweep the entire screen area. When flushing is completed, a second flushing cycle isautomatically triggered, pushing the collector assembly To its original position. The combined flush cycle takes 10-15 seconds.1. Inlet2. Outlet3. Coarse screen4. Fine screen5. Rotor chamber6. Nozzles7. Dirt collector assembly8. Rotor9. Flushing valve10. Piston11. Flush valve 

Grooved Disc ElementsThese elements are constructed from plastic discs that are stacked onto a telescopic core. The discs are grooved on both sides. These grooves intersect to form the filtration element when compressed on the core. Disc filters are surface & depth filteration. The disc element provides especially effective retention of organic matter. The effective filtration area is comprised of both the outside surface and the channels formed by the intersected grooves. Suspended organic particulate adheres to the grooved surface. Cleaning the cartridge is made simple by the unique design of the telescopic core, which allows the discs to separate during the cleaning process. Disc elements are available for use with 1"-3" Amiad plastic filters and 2"-4" Amiad steel filters.   

Manual FiltersA wide range of plastic and steel filters from 3/4" to 14"Interchangeable filter elements to suit specific needsFiltration degrees available from 800 to 22 micronSimple and easy maintenanceAll filter elements are extractable for cleaningMinimal head loss even at high flow-ratesRated operation pressure: 10 bar

Microfiber TechnologyTextile fibers are widely used for fine filtration in the disposable cartridge filter market. The Amiad AMF2 filter uses fiber thread technology to create a self-cleaning filter system. The basic filtration element in a "Microfiber" filter is the "thread cassette". Fine threads, which are 10 micron in diameter, are wound over a rigid grooved base plate. Water flows through the thread layers into the grooves and channel the water to specially designed outlets. The rigid base plate supports the thread layers and also plays a major role in the cleaning process of the media. The filter cassettes are mounted on hollow collector pipes.The cleaning mechanics High-pressure water jets spray through the thread layers hit the grooved base plate and reject back through the layers again. The contaminant is carried off the cassettes by the reject stream. Therefore, no dirt passes through the filter during back-flush. The filtration mechanics are a combination of surface and depth filtration. The design velocity through the media is 1-40 m/h. The newly developed filters is efficient for Drinking Water filtration, including the removal of Cryptosporidium, as well as for Swimming Pools, Reverse Osmosis protection, Cooling Tower side stream filtration for Legionella reduction, etc.The cleaning processThe filtered water flows from the four collector pipes to the filter's outlets. As dirt builds up on and in the cassettes, the pressure differential across the cassettes increases. When the differential pressure reaches a pre-set adjustable level, it triggers the filtration system's flush sequence. Flush sequences also can be triggered at pre-set timed intervals. The flush sequence is governed by an electronic control unit or by manual input.   

Membrane filtration is a technique used to separate particles from a liquid in order to purify it.In membrane filtration, a solvent is passed through a semi-permeable membrane. The membrane's permeability is determined by the size of the pores in the membrane, and acts as a barrier to particles which are larger than the pores, while the rest of the solvent can pass freely through the membrane. The result is a cleaned and filtered fluid on one side of the membrane, with the removed solute on the other.There are three membrane filtration processes:Microfiltration [MF] - MF is a low pressure [up to 100 psi (7 bar)] process for separating larger size solutes from aqueous solutions by means of a semi-permeable membrane. This process is carried out byhaving a process solution flow along a membrane surface under pressure. Retained solutes (such as particulate matter) leave with the flowing process stream and do not accumulate on the membrane surface.Pore ranges from 0.1 - 3 µm (micron meter).Applications:Clarification of dark juices for example, in the clarification of wine and dark juices, MF is to separate the suspended solids from the juice to produce a low turbidity juice while allowing the passage of color and flavor.Wastewater treatmentUltrafiltration [UF] - UF is a low pressure [up to 150 psi (10 bar)] process for separating solutes from aqueous solutions by means of a semi-permeable membrane. UF provides an essentially complete barrier against particles larger than the pore size, bacteria and the much smaller viruses usually found in the feed water.UF operates by a surface removal mechanism resembling a fine sieve with a highly uniform pore size. Any particles greater than the pore size are rejected. This characteristic makes UF membranes ideal for meeting absolute filtration quality requirements.In addition to high removal efficiency and an absolute removal rating, UF membranes tend to be more compact, allow higher automation with unattended operation and have lower chemical usage.The pore size is approx. 0.02 µm (micron meter).Applications:Microbiological contaminants rejection [Rejection of Cryptosporidium]Reverse osmosis pre treatment [Reduction of SDI and TOC (Total Organic Carbon)]Reduction of Turbidity [colloids, proteins, large organic molecule]Wastewater treatmentNanofiltration [NF] – NF is a low to moderately high pressure [up to 450 psi (31 bar)] process. Pore sizes range between UF and RO. Pores have not been observed in NF membranes under any microscope, however, water can still pass through the membrane and multivalent salts and low molecular weight organics are rejected. It is difficult to predict the performance of NF membranes since membrane rejection is influenced by the size, structure and charge of the components in solution. As a result, piloting is highly recommended for NF applications, even if a detailed feed water analysis is available.Applications:Water softeningOverall reduction of TDS (Total Dissolved Solids)Color and TOC ( Total Organic Carbon).Separation of organic from inorganic matter (in special food and wastewater applications)