ClearFlow Co. · 澄流科技

Screw press & industrial pumps for water treatment

We design, manufacture, and supply screw press dewatering machines and industrial water pumps.
Serving municipal sewage plants and industrial wastewater projects since 2014.

What we do

Two product lines, one mission: reliable equipment that runs unattended for years.

The screw press (volute dewatering machine) compresses sludge from 95–99% moisture down to 75–82% — fully automatic, footprint 40% smaller than belt presses, energy use 30% lower. The industrial pump line covers submersible, centrifugal, and dosing pumps for water intake, transfer, and chemical injection across the same treatment plants.

Core products

SD-Pro 302 Screw Press Dewatering Machine

8–15 m³/h capacity. Standard model. Designed for daily 10,000–30,000 m³ municipal sewage plants and industrial sludge dewatering.

8–15 m³/h Fully automatic Remote monitoring optional

SD-Midi 201 Compact Screw Press

3–8 m³/h capacity. Mid-size model for daily 5,000–10,000 m³ plants and food processing, aquaculture pre-treatment.

3–8 m³/h Compact design Low noise

WQ Series Submersible Sewage Pump

0.75–22 kW. Cast iron body, stainless impeller. For sewage transfer, stormwater drainage, and industrial wastewater handling. IP68, 20 m max immersion.

0.75–22 kW IP68 20 m depth

D-Series Dosing Pump (Metering Pump)

0.5–500 L/h flow range. For PAM/PAC chemical dosing, pH adjustment, and disinfection injection. Mechanical diaphragm, high accuracy.

0.5–500 L/h PAM / PAC High accuracy

Why WaterTreat Pro

Equipment that runs unattended for years. PLC control, self-cleaning ring stack, automatic pressure adjustment on the screw press. IP68 sealed pump motors. Mean time between failures measured in tens of thousands of hours.

Compact, modular, container-shippable. Both the screw press and pumps ship as complete skids. Land in your plant, connect power and piping, run.

JIS-grade material standards. All wetted parts in SUS 304 / 316L. Material certificates shipped with every order. Compatible with Japanese plant documentation requirements.

Remote monitoring ready. Optional IoT module exposes runtime, current, pressure differential, and bearing temperature to your SCADA, plant app, or cloud dashboard.

Typical applications

Municipal sewage treatment — primary, secondary, and excess sludge dewatering
Industrial wastewater — chemical, dyeing, paper, electroplating sludge
Food processing — slaughterhouse, brewing, dairy wastewater
Aquaculture and livestock wastewater pre-treatment
River dredging and lake sediment dewatering
Sewage transfer and stormwater pumping stations
Chemical dosing for coagulation, flocculation, pH adjustment

Selected projects

Suzhou municipal sewage plant phase 3

80,000 m³/d capacity. 4 × SD-Pro 302 screw presses with auto-dosing. Online since Sep 2020, average 18 h/day runtime, output cake moisture steady at 78–80%.

Shaoxing dyeing industrial park

15,000 m³/d capacity. High-viscosity dyeing sludge, 2 × SD-Midi 201 in series. Cake moisture 80–82%, fit for thermal co-processing at cement kilns.

Jakarta food processing plant upgrade

5,000 m³/d capacity. Slaughterhouse wastewater, 2 × SD-Pro 302 (316L) + WQ submersible pumps + remote monitoring. Online since Mar 2023.

Need a product datasheet, sizing help, or want to talk to an engineer — contact us.

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Product / Screw press dewatering

SD-Pro 302 Screw Press Dewatering Machine

8–15 m³/h · Cake moisture 75–82% · Fully automatic, runs 24/7

Overview

The SD-Pro 302 is our standard-capacity flagship, designed for daily 10,000–30,000 m³ municipal sewage plants and industrial sludge dewatering applications. Ships as a complete skid — connect power, feed sludge, run. PLC-controlled with HMI touchscreen, automatic ring-stack cleaning, automatic back-pressure adjustment, fault self-diagnosis. Optional IoT module for remote monitoring.

Core specifications

Parameter	Value
Model	SD-Pro 302
Type	Volute (screw) dewatering press
Capacity	8–15 m³/h (depends on sludge properties)
Feed moisture	95–99%
Cake moisture	75–82%
Solid recovery rate	≥ 95%
Main motor power	3.7 kW (screw shaft) + 0.75 kW (flushing pump)
Power supply	3-phase, 380 V, 50 Hz (customizable 400/415 V)
Ring gap	0.5–2.0 mm adjustable
Moving ring material	SUS 304 stainless steel (316L optional)
Screw shaft material	SUS 304 stainless steel, surface hardened
Overall dimensions	2,800 × 1,200 × 1,800 mm (L×W×H)
Weight (empty)	~1,800 kg
Control	PLC + touchscreen, auto / manual switchable
Operating mode	24-hour continuous
Polymer dosing	PAM anionic, auto dosing system included
Protection class	Main body IP55, control cabinet IP54
Noise level	≤ 75 dB(A) at 1 m
Remote monitoring	Optional 4G / WiFi / Ethernet module

Five core advantages

1. Fully automatic, low operator requirement

PLC + auto-cleaning + auto pressure adjustment. The full dewatering process runs without an operator on station. Fault self-diagnosis, audible/visual alarms, live display of current, differential pressure, and flow. One operator per shift is enough for routine inspection.

2. Compact footprint, modular delivery

Main body, flocculation tank, metering pump, and control panel are integrated on a single skid. Footprint is 40%+ smaller than a belt press of the same capacity. The whole unit ships in a standard 20 ft container — install in 2–3 days on site.

3. Self-cleaning ring stack, no clogging

The screw shaft rotation drives the moving ring stack to self-clean. Ring gap adjustable from 0.5–2.0 mm. Handles oily sludge, fibrous sludge, activated sludge, and anaerobic digested sludge without ring clogging.

4. Low energy, low operating cost

Compared to belt presses: no flushing water (saves water), no high-power motor (saves energy), low filter-cloth wear (saves consumables). Total operating cost ~30% lower for the same capacity.

5. Remote monitoring (optional)

IoT module connects to plant SCADA, mobile app, or cloud dashboard. Operations team can check every unit's runtime, ring pressure differential, and current from the office or while traveling. Early warnings three months before failure in our reference installs.

Applicable scenarios

Municipal sewage — primary, excess, and mixed sludge dewatering
Industrial wastewater — chemical, dyeing, paper, electroplating, pharmaceutical
Food processing — slaughterhouse, brewing, dairy, starch production
Aquaculture wastewater pre-treatment
River and lake sediment dewatering

Material standards

All wetted parts in SUS 304 stainless steel. 316L optional for corrosive sludge. Frame in carbon steel with anti-corrosion coating. Electrical components from Schneider / Siemens. Materials comply with JIS G4303 / G4304 (Japan), ASTM A240 (US). Material certificates available on request — important for Japanese end-clients.

Downloads

Inquiry and technical consultation

For a quote, sizing, or to discuss your project — contact our engineers. Typical response within 1 business day. To get a precise sizing and operating cost estimate, please share: sludge type, daily treatment volume, feed moisture, local electricity price.

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Product / Industrial pumps

Industrial pumps for water and wastewater

Submersible sewage pumps · Centrifugal transfer pumps · Metering pumps

Overview

Three pump families covering the most common duties in a water or wastewater treatment plant: raw sewage transfer, sludge recirculation, and chemical dosing. IP68 sealed motors, stainless impellers, JIS-grade materials. Sold standalone or as part of an integrated treatment skid.

WQ series — Submersible sewage pump

Parameter	Value
Power range	0.75–22 kW
Flow range	10–500 m³/h
Head range	5–45 m
Outlet size	DN50 – DN150
Body material	Cast iron ASTM 35B
Impeller material	SUS 304 / 316L stainless steel, clog-resistant open type
Shaft material	SUS 420 stainless steel
Mechanical seal	Tungsten carbide vs silicon carbide dual face
Protection	IP68, max immersion 20 m
Insulation class	F (155 °C)
Cable	10 m heavy-duty waterproof cable
Protection features	Stator temperature sensor, water-in-oil sensor
Installation	Auto-coupling or free-standing

Typical duties: raw sewage intake, primary sludge transfer, stormwater drainage, industrial wastewater lift station. Open impeller design passes solids up to 80 mm without clogging.

ISG series — Vertical centrifugal transfer pump

Parameter	Value
Power range	1.5–75 kW
Flow range	5–500 m³/h
Head range	10–125 m
Inlet / outlet	DN50 – DN200 flange
Body material	Cast iron ASTM 35B
Impeller material	SUS 304 stainless steel, closed type
Shaft seal	Mechanical seal (Burgmann-grade)
Max medium temp	80 °C
Max solids passage	20 mm
Connection standard	JIS B2239 / DIN / ANSI flanges

Typical duties: clean water transfer, treated effluent pumping, industrial process water circulation, boiler feed. Energy-efficient IE3 / IE4 motor options.

D-series — Mechanical diaphragm dosing pump

Parameter	Value
Flow range	0.5–500 L/h (per pump head)
Max pressure	10 bar
Accuracy	± 1%
Stroke adjustment	0–100% manual or 4–20 mA analog
Pump head material	PVC / PP / PVDF / SUS 316L (chemical compatibility)
Diaphragm	PTFE, dual layer
Valve material	Ceramic ball + FKM / EPDM / PTFE seal
Suitable media	PAM, PAC, NaClO, HCl, NaOH, coagulants, flocculants
Power supply	3-phase 380 V or single-phase 220 V

Typical duties: coagulant / flocculant dosing, pH adjustment, disinfectant injection (chlorine, hypochlorite), nutrient removal dosing. Multiple pump head options for different chemical compatibility.

Downloads

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Project cases

Three reference projects, anonymized where required, covering municipal, industrial, and overseas installations.

Case 1 — Suzhou municipal sewage plant phase 3

Location: Suzhou, Jiangsu, China

Online since: September 2020

Treatment capacity: 80,000 m³/d

Process: A²/O + sludge dewatering

Sludge properties: Primary + excess activated sludge, 97–98% feed moisture

Equipment: 4 × SD-Pro 302 screw press in parallel + PAM auto-dosing skid + WQ submersible pumps for sludge transfer. Optional remote monitoring module on all 4 units.

Results: Cake moisture steady at 78–80%, solid recovery ≥ 95%, single-unit average runtime 18 h/day. Compared to phase 2's belt press: water saving 60%, electricity saving 35%, filter-cloth replacement from 2 times/month to 1 time/quarter. As of Aug 2026: 50,000+ cumulative runtime hours, no major repair on any of the 4 units.

Case 2 — Shaoxing dyeing industrial park

Location: Shaoxing, Zhejiang, China

Online since: May 2022

Treatment capacity: 15,000 m³/d

Process: Physicochemical + biological + sludge dewatering

Sludge properties: Dyeing sludge (high viscosity, dye content, alkaline pH), 96–97% feed moisture

Equipment: 2 × SD-Midi 201 in series (high-viscosity variant with enlarged screw pitch) + PAC + PAM two-stage dosing system + D-series dosing pumps.

Results: 5 m³/h capacity, cake moisture 80–82%, cake suitable for thermal co-processing at cement kilns. Two and a half years of operation with zero ring-stack clogging incidents — operations team has specifically praised the self-cleaning ring design.

Case 3 — Jakarta food processing plant upgrade

Location: Jakarta, Indonesia

Online since: March 2023

Treatment capacity: 5,000 m³/d

Process: Dissolved air flotation + A/O + sludge dewatering

Sludge properties: Slaughterhouse wastewater (high oil, high protein), 96–98% feed moisture

Equipment: 2 × SD-Pro 302 (316L custom version for oil corrosion) + WQ submersible pumps + D-series dosing pumps + remote monitoring (4G connectivity to Jakarta HQ).

Results: Cake moisture 78–80%, ring gaps stayed clean even with high-oil sludge. Remote monitoring surfaced 3 early warnings in year one (bearing temperature drift) — all resolved via remote guidance to local team, zero unplanned downtime.

Want to see more cases or discuss your project — contact sales.

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About

About ClearFlow Co.

澄流科技 — Water treatment equipment manufacturer since 2014.

Company

ClearFlow Co. (澄流科技) designs and manufactures water treatment equipment at our 6,500 m² production facility in Jiangsu, China. Annual capacity 500 units of screw presses and 2,000 units of pumps. Our products operate in 200+ domestic sewage plants and ship to Southeast Asia, the Middle East, Europe, and South America.

Engineering and manufacturing

Engineering team of 25 covering hydraulic modeling, mechanical design, electrical control, and material processes. From screw shaft hydraulic optimization to ring-stack structural design, we invest continuously in R&D and ship 1–2 new models or variants each year.

Key processes: precision machining, dynamic balance calibration, 72-hour continuous burn-in testing, ring gap accuracy inspection.

Certifications

ISO 9001:2015 / ISO 14001:2015 / CE / EAC (Russia) / CCC (China).

Material compliance with JIS G4303 / G4304 (Japan), ASTM A240 (US). Material certificates and third-party inspection reports available on request — required by Japanese end-clients.

Service

2-year warranty on complete machines, 1-year on main wearing parts. 24-hour response domestically, 48-hour overseas. Spare parts inventory in all major Chinese port cities.

Authorized service points in 8 overseas markets: Malaysia, Indonesia, Thailand, Vietnam, India, Saudi Arabia, Turkey, Mexico.

Why JIS-grade materials matter

Japanese end-clients demand strict material traceability. We supply mill certificates (material composition, mechanical properties, non-destructive testing) with every shipment. Our pump and screw press wetted parts can be ordered in SUS 304, SUS 316L, or special alloys (e.g. duplex 2205) for higher chloride resistance.

Interested in OEM / ODM / distribution partnerships — contact sales.

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Contact

Contact sales

Tell us about your project — typical response within 1 business day.

Inquiry form

For a precise sizing and operating cost estimate, please include: sludge or media type, daily treatment volume, moisture content, local electricity price, target delivery date.

Headquarters

ClearFlow Co., Ltd. (澄流科技股份有限公司)

Industrial Park, Suzhou, Jiangsu, China
Tel: +86 512 XXXX XXXX
Email: sales@watertreatpro.example

Overseas service points

Kuala Lumpur · Jakarta · Bangkok · Ho Chi Minh City · Mumbai · Riyadh · Istanbul · Monterrey.

After-sales and spare parts

24-hour response domestically, 48-hour overseas. For spare parts quotes, email spareparts@watertreatpro.example with equipment serial number and parts list.

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