Sediment Removal Filters


What Is A Sediment Removal Filter?

A sediment removal filter captures and removes particulate matter like dirt and debris from your water. Sediment is a generic term for all the particulate matter in your water that is not liquid. Flakes of rust can enter your water supply from corroded galvanized plumbing. Rainwater can carry silt, clay, soil, and grains of sand into your groundwater supply. Flow changes in your water main can also transport sediment to your home. The sediment filter is the first line of defense against this dirt and debris. It prohibits all this solid particulate from entering your water supply and impeding the performance of your water filtration systems. 

Polypropylene Sediment Removal Filter – A sediment filter traps and removes suspended solids from your water supply. Debris from stormwater runoff and rust flecks from aging pipes can leave your water discolored and unappetizing. Sediment build-up can wreak havoc on appliances, clogging up valves and fixtures and ruining hot water heaters. Sediment also prevents filtration systems like reverse osmosis and ultraviolet purification from operating efficiently. Sediment filters keep your water clear and are an integral component of the water filtration process. A sediment filtration system is the guardian of your home and your water.

What are the different types of sediment filters? 

What is a pp sediment removal filter?

Polypropylene filter captures and removes particulate matter like dirt and debris from your water. Sediment is a generic term for all the particulate matter in your water that is not liquid. Flakes of rust can enter your water supply from corroded galvanized plumbing. Rainwater can carry silt, clay, soil, and grains of sand into your good groundwater supply. Flow changes in your water main can also transport sediment to your home. The sediment filter is the first line of defense against this dirt and debris. It prohibits all this solid particulate from entering your water supply and impeding the performance of your water filtration systems. 

Sediment removal filters exist in a multitude of applications. Restaurants and coffee shops use sediment prefilters to ensure the quality of their food and beverages. Whole house filtration systems employ sediment filtration to eliminate particulate matter from entering your faucets and showers and to protect the lifespan of other filters. Your pool filter cartridges are a form of sediment filter, blocking dirt and clay from muddying your pristine swimming water. Any instance in which clean water is imperative, you will likely find some form of sediment filter.  

How A Melt-Blow Filter Is Made

Below is a short video of how a melt-blown water filter is made.

Function Of The
Polypropylene Filter

The function of the polypropylene sediment removal filter cartridge filter is to separate substances or particles from the liquid. The cartridge filter is a medium to filtrate a substance that flows with liquid. Cartridge filter in this project focuses on a water filtration system that usually used at houses and small-scale industries. The volume flow rate relates to the pressure of the water that flows through the pipe system. Cartridge filters function as a media that reduced pressure from the water flow and call pressure drop. Sediment sand particles function as particles that flow with the water and will filtrate with a cartridge filter. Sediment sand makes contact on the surface of the cartridge filter depend on the volume flow rate of water. The cartridge will be clogged because of sediment sand clog on the surface of the cartridge filter when tried to enter the cartridge filter. This situation makes the filtration system has different pressure on the entrance and the exit of the cartridge housing. Different pressure call pressure drop represents the pressure drop of the cartridge. The pressure drop can relate to the volume flow rate and determining the life span and maximum condition of the cartridge filter. The maximum clogging condition happens because the pressure of the cartridge filter does not increase anymore and the cartridge filter has fully clogged with sediment sand.

Specifications Of A
Polypropylene Sediment
Removal Filter

  • Inner core: Polypropylene (PP)
  • End caps: Polypropylene (PP)
  • Cage: Polypropylene (PP)
  • Gaskets/O-Rings options: Buna-N, EPDM, Silicone, Viton, Teflon
  • Max. temperature: 176°F (80°C)
  • Recommended differential pressure: 35 psi (2.4 bar)
  • Micron ratings: 5.0µm
Manufactured with a true graded density, these elements exhibit a high void volume that results in low clean differential pressure losses and excellent dirt holding capacity when compared to similarly rated elements. Each cartridge is complete with integral support for maximum strength. The superior structure remains integral even under severe operating conditions and is less prone to media migration and breakthrough often found on other unsupported spunbonded products. Our cartridges are produced using a unique manufacturing process resulting in the following features: Available from 1 to 50um Consistent reliable performance

Unique Construction Of The Sediment Removal Filter

  • One-piece high strength all polypropylene support core
  • High void volume, resulting in low clean p and excellent dirt holding capacity
  • Endcap welded directly to the core for extra security and strength
  • Thermally bonded fiber matrix minimizes fiber migration
  • One-piece construction up to 1016mm (40″) ADVANTAGE grade featuring molded end caps and rigid outer support cage Optional glass filled core and end caps for high strength/temperature applications

Features Of The
Sediment Removal Filter

  • Low-pressure loss
  • Suitable for fresh water and seawater applications
  • Less prone to media migration
  • Materials meet US FDA Title 21 and USP Class VI requirements
  • True grade sediment filter
  • 100% Polypropylene
  • Consistent reliable performance

How does a sediment filter work?

Sediment filters work through a process called mechanical filtration. Mechanical filtration physically blocks unwanted particulate matter from infiltrating your water supply. Think of it like a screen door on your house. You want the refreshing breeze to flow through your home, but you don’t want bugs or leaves blowing in with it. The screen door is acting as a mechanical filter. Similarly, sediment filters have enough porosity to allow water to flow into your home but can capture the dirt and sand the water is carrying. Sediment filters are the net that catches the particulate matter traveling in your water.

Some sediment filters use expansive surface areas to catch large amounts of debris. Other sediment filters use a depth gradient to filter out suspended particles. These force water through thick walls of filter media that become increasingly tight as the water nears the core, filtering out smaller and smaller particulate matter along the way.

Why use the melt blown sediment filter cartridges

  • Low-pressure loss
  • Suitable for fresh water and seawater applications
  • Less prone to media migration
  • Materials meet US FDA Title 21 and USP Class VI requirements
  • True grade sediment filter
  • 100% Polypropylene
  • Consistent reliable performance

String Wound Sediment Filter

String wound sediment filter cartridges are structured with loose outer layers and tight inner layers which can offer true depth filtration for high dirt holding capacity and extremely low media migration to ensure temperature and chemical compatibility. The main advantage of the string wound filter is its exceptionally high structural strength; therefore, they can withstand severe operating conditions.

  • This is a filter that is capable of eliminating rust, dirt, and other sediments from water by using fibers.
  • It is considerably cheap, offers good filtration, and has a strong resistance to chemicals.
  • The string material can be from nylon, polyester, cotton, etc.
  • It wraps on a center core like stainless steel or polypropylene.


  • Fits all the standard housings
  • Low-pressure drop, high dirt holding capacity, and long service life
  • Loose outer layers and tight inner layers offer effective depth filtration
  • Various filter media fit with various applications

Applications Of The String Wound Sediment Filter

  • Food&Beverage
  • Semiconductor
  • Pharmaceuticals
  • ElectricPlating
  • DI&ROpretreatment

Specifications Of The String Wound Filter

  • Filtermedia: Polypropylene, Fibrillated Polypropylene, Cotton, Glass Fibre
  • Outside diameter: 55mm, 61mm, 63mm, 65mm, 115mm
  • Inner diameter: 28mm, 30mm
  • Length: 10, 20, 30, 40
  • Micron Rating (micron): 5, 10, 20, 30, 50, 75, 100
  • Polypropylene material for non-organic solvent, maximum recommended Operating temperature <70 ˚C
  • Bleached cotton material filter cartridge with stainless core applies to organic solvent, water, oil, alkalinity solvent, beverage, pharmaceuticals, maximum Recommended operating temperature: 120˚C.

The latest development in string-wound cartridges has overcome problems with roving and friction-spun yarns and has all the features of melt-blown cartridges. The media of the new string-wound cartridge is made from the continuous filaments-each individual filament that continues throughout the entire length. There are no short fibers, making the cartridge free from any media migration. These continuous filaments are melt-spun in a way that no chemicals like spin-finish, wetting, and antistatic agents, surfactants, emulsifiers, etc., are required. These chemical-free continuous filaments are then randomly oriented to each other, intermixed, looped, and entwined forming a non-round, highly stable, bulky yarn.

Random short loops protrude from the surface of the yarn. As the filter is wound, every single yarn traps part of the loops of the adjacent yarn giving a highly stable structure. The yarns get locked in place and will not roll or move aside. This stable structure also gives excellent sealing. It easily passes the paper clip test. Yarn that doesn’t shift easily also makes the filter resistant to particle unloading. With advancements in winding technology (computer controls) and pitch, the number of crossings and space between each yarn can be continuously varied and controlled from start to finish of the cartridge winding. The inner layers of yarn can be wound closer together and the distance between the yarns can be gradually increased toward the outer layers. This achieves density grading without changing the winding tensions for more consistent performance in string-wound cartridges. Coarser particles are trapped in the outer layers and finer particles in the inner layers. In this cartridge, the liquid flows through the entire yarn structure-there are no typical diamond-shaped holes.

What is the History of String Wound Cartridge Filter?

  • String wound cartridge filters date back several years.
  • The first one was sold in the United States in the mid-1930s.
  • The construction was a woven wire mesh bound in cotton wool, that was in a diamond pattern.
  • The edges of the diamond forms were the key points at which the contaminants would stick.
  • This was rather than filtering the sand through the entire formation.
  • Regular cartridges are built from ‘roving’ or ‘friction spun’ fiber.
  • Also, considerations like media displacement and chemical leaching have been among the main drawbacks to the efficacy of cartridges.
  • With recent innovation in filter media for the production of string wound cartridges, issues such as media migration and chemical leaching are on the minimum.
  • Filter cartridges, consisting of cotton yarn materials and metal frames, came about in the mid-1930s.
  • By the late 1970s, polypropylene (PP) core cartridges and yarn were becoming popular.
  • This is since they had a wide range of chemical resistance and one could use it in many applications.
  • Also, they could capture and resist the growth of microorganisms.
  • This era of string wound cartridge filters usually uses roving rather than conventional yarns.
  • These were rolls that twist or fiber strands that were more budget-friendly.
  • Also, the lifespan of the filter cartridge went up.
  • This is because more water was flowing through it easily.
  • In subsequent years, ‘friction spun’ wool took over.
  • The friction spun wool is only similar in appearance to roving but is relatively bigger and heavier.
  • The result of this is an increase in dirt-holding capability and lower resistance to fluid movement.

Where Are String Wound Filter Cartridges Used?

Several industries use this filter cartridge in cleaning water.

They include:

Food and beverage industries

Examples include:

  1. Water filtration
  2. Beverage processing filtration
  3. Syrup
  4. Alcohol
  5. Cola
  6. Drinks
  7. Edible oil

Electronic industries

Uses include:
  1. Films
  2. Resins
  3. Electroplating
  4. Pure water
  5. Electroplating
  6. Microelectronics
  7. Fibers
  8. Organic solvents
  9. Printed circuit board

Chemical and petroleum industries

Applications include:
  1. Pre-filtration of RO/DI
  2. Cosmetics
  3. Paints
  4. Photographic washing liquids
  5. Filtration of alkali and acids
  6. Coatings
  7. Petrochemicals
  8. Raw acrylic materials
  9. Chemical filtration
  10. Inks

Industrial oil

The applications include:

  1. Desalination of seawater
  2. Filtration of power plant condensation water
  3. Plating bath filtration
  4. Filtration of hydraulic, lubricating, cutting, and other industrial oil

Pharmaceutical industries

Uses include:
  1. Filtration of syrup, alcohol, injections, etc.
  2. Preparation water filtration
  3. VC raw materials

Other uses

These include:
  1. Laser cooling water filtration
  2. Filtration of electroplating liquids
  3. Ultrasonic cleaning liquids.

How Does a String Wound Cartridge Filter Work?

  • The string that goes around the core forms a gradient density in a string would cartridge filter.
  • Also, the core of the string wound filter cartridge is tighter and the exterior is lighter.
  • The light outer weaving makes it possible to filter out large contaminants first.
  • Then as the water continues to pass through the string, fine sediments get caught in each layer.
  • The winding technique and the specific thickness of the string wound cartridge filter will enhance the dust holding capability.
  • Also, it will lengthen the service life and the efficiency of the string wound cartridge filter.
  • The accuracy of the string would cartridge filter depends on the tightness of the string.
  • One can control the machine to ensure the inside of the string is tight and the outside is loose.
  • Water with contaminants will pass via the string wound and as it passes, contaminants remain behind.
  • The clean water will then pass through and enter the core of the string wound cartridge filter.
  • It then exits the filter as more water gets in to undergo filtration.

What are the Advantages of Using String Wound Cartridge Filter?

String-wound cartridge filters originate from the new media that provides an efficient and cost-effective solution.

The advantages include:

  • The spinning method ensures that no chemicals leach in during the filtration process.
  • Also, the string wound will allow no media to migrate since it has continuous filaments.
  • The filter has high structural integrity thus the media will not move therefore offering an impressive knife-edge sealing.
  • Besides, it has an impressive solid to void ratio which enhances the dirt holding capability.
  • The dirty liquid will flow via the whole string wound cartridge filter as there is a low-pressure drop.
  • Also, the sturdy and firm media configuration will enhance the resistance to the dirt unloading.
  • A string would cartridge filter will offer more consistent performance.
  • Also, it improves the filtration process as the inner layers of the strings are dense and the outer layers are loose.

What are the Technical Features and Specifications of String Wound Cartridge Filter?

These features and specifications may vary from one string wound cartridge filter to the other.

The technical features include:

  • A maximum differential pressure of 2.5 bar.
  • An inner diameter of 28 mm and an outer diameter of between 62 mm and 114 mm.
  • The length of the string wound cartridge filter can be 5, 10, 20, 30, or 40 inches.
  • Also, it has a filter rating of between 0.5 μm and 150 μm with the option of customizing on request.
  • The maximum working temperature of cotton is 160 °C, polypropylene is 180 °C, polyester is 121 °C, and fiberglass is 400 °C.
  • A maximum flow rate of 5 to 28 GPM and 10 to 30 GPM for a diameter of 2.5 and 4.5 inches respectively.
  • Besides, it comes in a wide array of micron ratings.

On the other hand, the specifications of a string wound cartridge filter are:

  • It has a large dirt holding capability and is also durable.
  • Besides, it offers an absolute and depth filtration process.
  • Also, one can customize the configuration and the particle retention.
  • The end caps or O-rings are some available options you can include in the filter.
  • Also, they conform to Food and Drug Administration [FDA] standard that is suitable for food and beverage usages.
  • It can meet a wide array of applications as they have high-temperature resistance and chemical compatibility.
  • They also come in varying lengths to fit onto existing filter housings.

What is a sediment filter used for?

Sediment filters are important components of water treatment systems. Anytime water has dirt, debris, or fine particulate, a sediment filter is necessary. Sediment filters are also vital in ensuring other filters and water filtration equipment can operate efficiently. 

Filtering Water For The Reverse Osmosis

Reverse osmosis systems always use a sediment pre-filter. The sediment filter functions as a pretreatment and protects the Reverse Osmosis system. The RO System membrane rejects particulate matter, and the water rejected by the membrane drains out through a flow restrictor. This flow restrictor creates pressure for the RO membrane and controls the recovery ratio of the reverse osmosis system. The sediment prefilter on an RO system is protecting the flow restrictor from clogging rather than protecting the membrane itself.

UV Sterilizer Purification

For the UV system to be effective, the water passing through it needs to be free of sediments/turbidity that may dim the UV light. This is because once the sediments/turbidity block out the UV light, the effectiveness of the UV in killing bacteria in water will be reduced to almost nothing.

Sediment Filtration For The Whole House Water

Allowing water with sediment to flow through the house pipes can cause the pipes to clog. As time goes, they may even burst. It is important to make sure that the water flowing into your house pipes is sediment free. If not, it can damage you house appliances such as washing machines and dish washers.

Having a sediment filter will save you a lot of costs in replacing your pipes and appliances.

Filter Bags

Liquid Filter bags are manufactured for optimum filtration performance. They are made from carefully selected media, according to the specifications of the process industry. Various types of media are used such as needle felt, monofilament and multifilament. They are effective in removing solid particulate from liquids where large volumes of contamination are present or where highly viscous fluids are required to be filtered. They offer an effective solution to many filtration problems.

Size4″ x 10″, 4″ x 20″, 7″ x 16″, 7″ x 32″
Configuration100% Welded,100% Stitched
MaterialPolypropylene, Polyester, Nylon, Cotton


  • High performance
  • High flow rates
  • Low pressure drop
  • Broad chemical compatibility
  • Positive sealing arrangement with choice of materials
  • High dirt holding capacity
  • High Temp. resistance


  • Water
  • Food oil
  • Viscose fluid
  • Liquors
  • Paint
  • Inks
  • Resins
  • Oil
  • Fats

Other Details:

  • Collar Type:PP, SS Ring, Snap band, Rubber

Sand Filter

Impurities are removed from water by passing through a bed of quartzite sand of various gradation. The installation of a Sand filter is recommended when the load of turbidity (sand, lime, scales, colloids, etc.) of water is very high, affecting the water quality and resulting in deposits and encrustations on pipelines, boilers, taps and on domestic and industrial appliances in general.Multi- Media depth filters typically remove particles 5-15 microns in size or larger. All media included in our filters are carefully selected according to particle size, so the media retains its stratification during backwash and rinse. Automatic backwashing system removes the trapped contaminants within the filter bed and washes them down the drain.



Media Volume

Desgined Flow Rate

Control Valve


Tank Dimension


30 Liters





10″ x 35″


50 Liters





10″ x 54″


70 Liters





13″ x 54″


100 Liters





14″ x 65″


120 Liters





16″ x 65″


150 Liters





18″ x 65″


200 Liters





21″ x 62″


300 Liters





24″ x 72″


600 Liters





36″ x 72″


1200 Liters





46″ x 72″

Product Material:

  • Control Valve: Fleck / Clack /Autotrol / Manual.
  • Tank: glass-fiber reinforced polyethylene.
  • Treating material: Silica Sands (Quartz) & Gravels Distributor: PE

Working Conditions:

  • Max working pressure……………6 BAR
  • Min working pressure…………….2 BAR
  • Max working temperature…….50°C
Raw water source and quality is the key element that directly effect on the choice of filtration equipments. ROTEK is a worldwide leader in the residential and commercial water treatment industry. Our mission is to become the most customer- conscious, highest quality, lowest-cost producer in our industry. Please don’t hesitate to send us your inquiry and see how ROTEK can help to meet your water treatment needs.
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