Flow Water Filter 3/4" Whole House Mechanical String Cartridge PP20 USTM
Inline 3/4" filter for cold water, designed to protect home installations and household appliances. The set includes a 10" housing with Read moreShow less
Inline 3/4" filter for cold water, designed to protect home installations and household appliances. The set includes a 10" housing with a transparent cover, double sealing (2 O-rings), an air vent, and a PP20 20-micron string mechanical filter. The package includes a wrench and mounting elements to facilitate installation.
Benefits
- Captures sand and sediment
- Captures rust particles
- Protects tap aerators from sediment particles
- Protects subsequent filtration stages
Specifications
- Application
- Whole house
- Cartridge length
- 10″
- Cartridge type
- Sediment, String wound sediment
- Connection size
- 3/4″
- Filtration rating
- 20 µm
- Housing standard
- Slim 10″
View full specifications
- Maximum flow
- 25 l/min
- Maximum working pressure
- 6 bar
- Maximum working temperature
- 45 °C
- Product type
- Pre-filtration system
Description
Flow Water Filter 3/4" Whole House Mechanical String Cartridge PP20 USTM is a practical water filter for cold water, designed to protect household plumbing, fixtures, and appliances. The set includes a 10" housing with a transparent sump, air vent, double sealing, and a PP20 filter cartridge with a 20 micron filtration rating. It is an effective component of a home water filtration system and everyday water treatment that helps limit the passage of mechanical contaminants into the installation.

3/4" in-line filter for protecting the home and appliances
This flow-through inline filter is designed to operate on the cold water supply. It works well as protection for the entire water installation in a house or apartment, as well as for expensive appliances and selected water draw-off points.
This is a solution for people who want to reduce the presence of sediment and mechanical contaminants in utility water and extend the service life of the installation. Solid construction, 10" standard, and universal 3/4" connection make the filter easy to adapt to many applications.
Key advantages of the set
Flow-through 3/4" inline filter for cold water.
The set includes gaskets and a mounting wrench to make installation and use easier.
The set includes a PP20 filter cartridge – mechanical, string type.
10" housing with a transparent sump makes it easy to check the degree of cartridge загрязнение.
Double sealing system with two O-rings increases the tightness of the entire system.
The air vent supports proper housing operation and convenient servicing.
The filter can work individually or be connected in series as part of a more extensive water filtration system.
Versatile applications
Ideal for installation on the pipe supplying cold water to an apartment or before expensive appliances.
Works with a wide range of mechanical, specialty, and carbon cartridges available on the market.
The set includes a string cartridge with a filtration rating of 20M.
The standard 10" housing means the filter can serve as a standalone stage of mechanical filtration or as a pre-stage before more advanced solutions, such as an osmotic filter, reverse osmosis filter, or an under-sink reverse osmosis system. In household installations, such a filter cartridge helps limit the supply of sand, rust, and other suspended matter to subsequent system components.

Effective mechanical filtration with the PP20 string cartridge
The string cartridge, also referred to as a nonwoven cartridge, is one of the most commonly used solutions in mechanical water filtration. Its operation is based on trapping contaminants through the dense weave of string fibers, so the water passing further into the installation is better protected against suspended matter.
Captures all contaminants up to 20 microns in size.
Has a gradient structure, ensuring more precise and efficient filtration.
The USTM cartridge is characterized by a higher density of string-fiber weave compared with other cartridges available on the market.
It works perfectly in inline filters used for the whole house or apartment, as well as kitchen water filters installed under the sink.
Recommended for protecting water installations, appliances, and fixtures.
Has PZH approval.
Made in Poland.
Increased filtration efficiency
Thanks to the change in fiber density and type along the cartridge, it is possible to more effectively retain different types of contaminants. Fibers with a varied structure capture particles of different sizes, which improves filtration quality and supports more stable operation of the entire system.

Longer service life
The gradient structure of the string cartridge helps extend the operating time before clogging. In practice, this means less frequent cartridge replacement, more convenient use, and lower maintenance costs for the home filtration system.
Durable 10" housing construction
Two-piece 10" inline housing from WodaRO®, providing reliable protection for your water installation.
Consists of a transparent sump and a head with a 3/4" brass thread.
Double sealing system
Equipped with two sealing O-rings, ensuring maximum product tightness.
The gasket also helps maintain pressure inside the inline housing, preventing air from entering the system.

Reinforced version
Durable, high-quality housing guarantees safe and stable use.
The transparent sump makes it easy to assess the cartridge contamination level.
Air vent and ease of use
The housing is equipped with an air vent, which allows pressure inside the housing to be balanced with atmospheric pressure. This solution reduces the risk of damage to filtration or sealing elements and supports safe system operation.
Thanks to the air vent, water filters and inline housings can operate more efficiently, regardless of operating conditions and pressure in the water installation, which translates into improved water quality and longer service life of the devices.
Flexible system configuration
The filter can be installed individually or connected in series, allowing the installation to be adapted to the user's specific needs. In practice, this means the system can be expanded with additional filtration stages if needed in the future.

The model is designed for cold water. To maintain filtration efficiency and proper operation, regular inspection of the cartridge contamination level and replacement according to wear, water parameters, and the recommended service life is advised.
Set contents and installation
The set includes the elements needed for quick and correct installation. The complete package includes:
10" inline housing,
PP20 mechanical string cartridge,
sealing O-rings,
wrench,
mounting plate.
The gaskets and mounting wrench make installation and later service easier. The transparent sump also makes it quick to determine when the filter cartridge needs replacement.
Additional important information
- quantity in the set: 1

Technical specification
| Product type | Flow-through inline filter for cold water |
|---|---|
| Purpose | Protection of household plumbing, fixtures, and appliances |
| Connection diameter | 3/4" |
| Maximum operating pressure | 6 bar |
| Maximum operating temperature | 2-45 degrees Celsius |
| Cartridge standard | 10" |
| Cartridge included | Yes |
| Cartridge type | Mechanical, string |
| Filter height | 25 cm |
| Diameter | 5.5 cm |
| Service life | up to 14000 L / up to 6 months* |
| Capacity | up to 25 L/min |
| Filtration accuracy | 20M |
| Housing construction | Two-piece, with transparent sump |
| Head | With 3/4" brass thread |
| Sealing | Double, 2 O-rings |
| Additional equipment | Air vent, wrench, mounting plate |
Choose a set or individual cartridges. Replacement intervals depend on the cartridge and operating conditions.
Individual cartridges 3
Questions
What is the Flow Water Filter 3/4" Whole House Mechanical String Cartridge PP20 USTM water filter used for?
It is a flow-through filter for cold water, designed to protect the water installation in a house or apartment, as well as appliances and fixtures, from mechanical contaminants.
What contaminants does the PP20 cartridge remove?
The PP20 mechanical string cartridge traps contaminants up to 20 microns in size, such as sand, rust, and other mechanical suspended matter present in water.
Is the filter suitable for the whole house?
Yes, it can be installed on the pipe supplying cold water to an apartment or house, so it works as a pre-filter for the entire installation.
Can the Flow Water Filter 3/4" Whole House Mechanical String Cartridge PP20 USTM be installed before an appliance?
Yes, the filter is also recommended for installation before expensive appliances to reduce the amount of mechanical contaminants entering them.
Is the filter cartridge included?
Yes, the set includes 1 PP20 mechanical string cartridge with a 20M filtration rating.
What installation accessories are included in the set?
The set includes the inline housing, cartridge, sealing O-rings, wrench, and mounting plate. In addition, the set includes gaskets to make proper installation easier.
Is the filter compatible with other 10" cartridges?
Yes, the housing is compatible with a wide range of mechanical, specialty, and carbon cartridges available on the market, as long as they conform to the 10" standard.
Why are two O-rings used in the housing?
The double sealing system increases product tightness. The gasket also helps maintain proper pressure inside the housing and reduces the risk of air entering the system.
What is the function of the air vent?
The air vent equalizes the pressure inside the housing with atmospheric pressure, which helps protect filtration and sealing elements and supports more efficient filter operation.
How long can the PP20 cartridge be used?
The cartridge service life is up to 14,000 liters or up to 6 months. The actual service time depends on water quality and usage intensity.
Is the filter suitable for hot water?
No, the model is designed for cold water. The maximum operating temperature is 2-45 degrees Celsius.