FST Series Double Pass Reverse Osmosis System

Water Treatment System

When your process demands water purity beyond what single-pass RO can achieve—but without the complexity or chemical regeneration of mixed-bed deionization—a double pass RO system offers the optimal balance of performance, reliability, and operational economy. It also serves as an excellent pretreatment step before electrodeionization (EDI) for continuous ultrapure water production.

Category: Pretreatment System

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Double Pass Reverse Osmosis System Introduction:

The double pass reverse osmosis system is an advanced two-stage water purification solution engineered to deliver exceptionally low total dissolved solids (TDS)—often below 10 ppm—and superior water quality for applications where purity is critical. By passing feed water through two sequential RO stages, this system achieves significantly higher rejection rates than single-pass units, making it ideal for pharmaceuticals, electronics manufacturing, high-end beverage production, and laboratory-grade water needs.

In the first pass, pre-treated feed water is pressurized and filtered through high-rejection RO membranes, removing 95–99% of contaminants. The resulting permeate is then stored in an intermediate tank before being re-pressurized and processed through a second RO stage—further reducing TDS, silica, CO₂, and trace ions. Optional degasification or caustic dosing between passes can enhance performance by neutralizing carbon dioxide and improving second-pass rejection.

Double Pass Reverse Osmosis Machine Features:

Ultra-Low TDS Output: Consistently produces water with <5–10 ppm TDS.
High Rejection of Silica, Boron & Organics: Critical for semiconductor and pharma compliance.
Integrated Pre-Treatment: Includes multi-media filtration, activated carbon, softener (optional) and 5-micron cartridge filters.
Intermediate Break Tank with UV/Repressurization: Ensures stable feed to second pass and microbial control.
Advanced Controls: PLC-based automation with HMI interface, real-time monitoring, auto-flush and alarm protection.
Energy-Efficient Design: High-efficiency pumps and energy recovery options reduce operational costs.
Modular & Scalable: Available from 1,000 GPD to 50,000+ GPD.

Double Pass Reverse Osmosis System Parameter:

Model	Water Production T/H	Power kw	Salt Rejection Rate %	Inlet and Outlet Pipe Diamete rmm	Dimensions mm	Weight kg
FST-01D	1.0	4.4	＞99.5	DN32	16006001700	1500
FST-02D	2.0	7.0	＞99.5	DN32	38009001800	1800
FST-03D	3.0	8.0	＞99.5	DN40	380012001700	2500
FST-04D	6.0	18.5	＞99.5	DN50	480012501750	3200

Water Treatment System Video:

Water Treatment Machine FAQ:

Q: What does a water treatment system do?

A: It purifies raw water (from wells, rivers, or municipal supplies) by removing impurities like sediment, chlorine, heavy metals, bacteria, viruses, and dissolved salts—producing clean, safe water suitable for drinking, bottling, food production, or industrial processes.

Q: What are the main components of a typical purified water system?

A: Most systems include:

Pre-filters (sand, carbon, cartridge);
Water softener (optional, for hard water);
Reverse Osmosis (RO) unit – core purification stage;
UV sterilizer or ozone generator – for microbial control;
Polishing filters (e.g., 0.22μm);
Storage tank & re-circulation loop (for large-scale use);
Systems can be customized based on source water quality and end-use requirements.

Q: Can it treat well water or river water?

A: Yes—but heavily contaminated sources may require enhanced pre-treatment, such as:

Iron/manganese filters;
Ultrafiltration (UF);
Chemical dosing (anti-scalant, chlorine);

A full water analysis is essential before system design.

Q: Does it remove bacteria and viruses?

A: Absolutely. While RO membranes block most microbes, we add a final disinfection step:

UV lamp: Destroys 99.99% of bacteria/viruses without chemicals;
Ozone injection: Provides residual protection in storage tanks.

Note: RO alone is not a sterilization method—final disinfection is critical for potable water.

Q: Is the system automated?

A: Yes. Modern systems feature:

PLC or microprocessor control;
Auto-flushing, low-pressure shutdown, and leak detection;
Real-time monitoring of TDS, flow rate, pressure;
Optional IoT connectivity for remote diagnostics.

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ABOUT LUYE MACHINERY

Suzhou LUYE Packaging Technology Co.,Ltd. is a professional manufacturer engaged in beverage packaging machinery and various water treatment equipment. The company has 30 years of production experience, and absorbs advanced technology at home and abroad, constantly improve their products, enjoying a high reputation among users. At present, there are: 0.5-50T/H complete water treatment equipment, 2000-36000 bottles/hour mineral water, pure water, gas drinks complete filling, heat shrinkable film packaging molding production line; 50-2000 barrels/hour five gallon barrel production line; 2000-36000 bottles/hour vinegar, soy sauce, wine filling production line; juice, fruit tea, vegetable protein drinks complete production line.

Luye filling machines have been sold to Nigeria, Turkey, Mexico, Colombia, Peru, Argentina, Chile, Indonesia, Malaysia, Vietnam, Bangladesh, Saudi Arabia, South Africa, Egypt, Ghana, Tanzania, Ethiopia and other countries.

The Luye company adheres to the corporate spirit of "integrity, sincerity, pragmatism, and innovation"; it considers "high technology, high quality, and high standards" as its lifeline; it embraces technological innovation as its eternal corporate philosophy; and it strives to meet customer needs through comprehensive after-sales service. Simultaneously, it has proposed and implemented a development strategy of "multiple product lines, high technology, large-scale production, and complete sets of equipment."