Nuonuo is hugging a filter cartridge and smiling.

Three-stage Pre-filter – Flexible Cartridge Replacement, Graded Efficient Filtration

The three-stage pre-filter uses a 10" PP cotton filter cartridge, UDF filter cartridge, CTO filter cartridge or other cartridges for graded filtration of the water source. It removes large particles such as sediment and rust, adsorbs residual chlorine and odors, and eliminates organic matter, heavy metals, and other contaminants. This enhances water quality and taste, while also protecting downstream water purification equipment.

The three-stage pre-filter is typically installed at the entrance of the pipeline system or under the kitchen sink. Users can select and install specific filter types in the filter bottle based on water quality and specific filtration needs.

A three-stage pre-filter with a mounting plate and a black wrench
Structure
  1. Mounting plate: Used in combination with the filter bottle, it can be installed on the wall.
  2. Bottle cap: Made of PP material, it connects with the filter bottle. The inlet and outlet interface sizes are universal 1/4" or 1/2" or 1" copper thread.
  3. Pressure relief valve: When the pressure inside the bottle reaches a certain level and the bottle cap cannot be unscrewed, press the pressure relief valve to release the pressure inside the bottle, allowing the cap to be unscrewed.
  4. Filter bottle: Transparent PET material filter bottle, it is convenient for observing the filter cartridge usage status.
  5. Filter cartridge: Choose from PP cotton filter cartridge, UDF filter cartridge, CTO filter cartridge, etc., for graded filtration according to your needs.
  6. Wrench: It is used to tighten the filter bottle to prevent poor connection leading to water leakage.
Three-stage pre-filter structure model diagram
Features
  • The upper housing is made of PP material, and the lower housing is made of PET material, resistant to high temperatures and corrosion, with a long service life.
  • The PET material bottle body has high transparency, allowing for a clear view of observinig the filter cartridge's operating status.
  • It removes large particles, residual chlorine, odors, heavy metals, and other contaminants to improve water quality.
  • It has a simple structure, and can be flexibly installed under the kitchen sink or integrated with the pipeline system.
  • The inlet and outlet ports are 1/4", 1/2", or 1" universal ports, making installation convenient without the need for professional tools.
  • The leak-proof filter bottle top features a twist cap design, allowing for easy disassembly and filter cartridge replacement, offering flexible combinations.
  • Low maintenance cost, with affordable 10" universal filter cartridges, regular replacement ensures good performance.
Other Types

In addition to the three-stage pre-filter, there are also single-stage pre-filters with single-stage filter cartridges and dual-stage pre-filters with dual-stage filter cartridges. Users can choose the appropriate filter according to their needs.

A blue single-stage pre-filter
Single-stage Pre-filter

The single-stage pre-filter is the most basic filtration device. Usually installed at the beginning of the water supply pipeline, it is used to filter large particles of impurities in the water, such as sediment, rust, and suspended solids. Different filter cartridges can be replaced according to needs.

A blue dual-stage pre-filter
Dual-stage Pre-filter

The combination of commonly used PP cotton filter cartridges and CTO filter cartridges adds an additional filtration process based on the primary filter, mainly targeting finer particles and some dissolved pollutants, further enhancing the filtration effect.

Principle

The raw water first enters the first-stage PP cotton filter cartridge, removing large particles such as sediment, rust, and suspended solids from the water; Then it enters the second-stage UDF filter cartridge, adsorbing odors, chlorine, and organic compounds in the water, improving the taste of the water; Then it proceeds to the third-stage CTO filter cartridge, further adsorbing residual odors, heavy metals, and other pollutants in the water, finally resulting in filtered water.

The working principle schematic diagram of three-stage pre-filter
Specifications
Table 1: Three-stage Pre-filter Specifications
Material PP and PET
Inlet and Outlet Connections 1/4" or 1/2" or 1"
Filter Cartridge PP cotton filter cartridge + UDF filter cartridge + CTO filter cartridge
Filter Cartridge Size 10 "
Power Source Manual
Maximum Pressure Exceeds 20 kg
Accessories Bracket, wrench, screws
Net weight 16 kg
Gross weight 17 kg
Package dimensions
(Length × Width × Height)
53.5 × 44.5 × 35.5 cm