Which Submersible Pump Do You Need? — Range Comparison Cosmos manufactures six submersible pump models across four ranges. Match your fluid type and site conditions to the right model:CDW — Dewatering (Standard): 450–8,500 LPM, up to 86.5 M head, 1.5–50 HP. Solids up to 12 mm. Best for construction, basements, tunnels, mines (clean water). CDW High Head — Dewatering: 350–2,200 LPM, up to 140 M head, 5–75 HP. Solids up to 12 mm. Best for deep tunnels, mines, hydro power plants. CDW Ultra High Head — Dewatering: 50–200 m³/h, up to 200 M head, 50–120 HP. Best for major tunnels, deep mines, large infra projects. CNC — Non-Clog / Vortex: 1,250–1,500 LPM, up to 30 M head, 6–20 HP. Solids up to 70 mm. Best for sewage bypass, manhole cleaning, thick sludge. CSW — Sewage: 775–33,000 LPM, up to 60 M head, 2–200 HP. Solids 20–100 mm, SG up to 1.7. Best for municipal, STP/ETP, residential sewage. CSL — Slurry (Hi-Chrome): 1,584–5,834 LPM, up to 52.5 M head, up to 100 HP. Solids up to 70% by weight, SG up to 2.1. Best for mining, ash transfer, harbour dredging, power plants. CSL-TV — Slurry Twin Volute: Same specs as CSL, with improved hydraulic balance for extended bearing life in continuous duty.Quick selector: Clean construction runoff / groundwater → CDW. Large solids or sewage → CNC or CSW. Heavy slurry (mines, ash, dredge) → CSL. High discharge head (deep tunnels / mines) → CDW High Head or CDW Ultra High Head. Frequently Asked Questions What is the difference between CDW and CNC submersible pumps?The CDW (Dewatering) pump handles dirty or muddy water with solids up to 12 mm — ideal for construction sites and tunnels. The CNC (Non-Clog) pump uses a vortex impeller and handles solids up to 70 mm including thick sludge — used for sewage bypass and manhole cleaning. Choose CDW for volume dewatering; choose CNC when solids or sludge concentration is high. What is the difference between a submersible dewatering pump and a sewage pump?A submersible dewatering pump (CDW series) handles dirty or muddy water with small suspended solids (4–12 mm) at SG up to 1.1. A sewage pump (CSW series) handles sewage and wastewater with larger solids (20–100 mm) at higher specific gravity (up to 1.7). Do not use a dewatering pump for raw sewage — it will clog or fail. Which submersible pump is best for mining dewatering?For mine dewatering with high discharge head requirements, choose CDW High Head (up to 140 M) or CDW Ultra High Head (up to 200 M). For mines with slurry, ash, or tailings, choose the CSL (SG up to 2.1). The CDW standard range is not suitable for slurry duty. What HP submersible pump do I need for a construction site?The CDW range spans 1.5–50 HP (450–8,500 LPM). Rule of thumb: small sumps / basement → 3–5 HP; open foundation excavation → 5–20 HP; large tunnels or quarries → 20–50 HP. Contact Cosmos for a free pump sizing assessment. Can Cosmos submersible pumps handle seawater or saline water?Yes. The CDW range is available with an SS316 variant and optional sacrificial zinc anode for seawater and high-salinity environments. Specify the SS316 variant at time of enquiry for coastal or offshore applications.
At Cosmos Pumps, we understand that reliable pumping solutions are at the heart of smooth operations across industries. Water management, whether for construction sites, mining areas, municipal needs, or emergency situations, demands equipment that is not only efficient but also easy to handle. That is why we have engineered our range of portable submersible pumps to combine performance with convenience. Unlike traditional pumping systems, an electric submersible pump is designed to be placed directly in the fluid, eliminating priming issues and reducing energy loss. This makes them the preferred choice for dewatering and draining tasks where time and efficiency are critical.
Our submersible dewatering pump is designed to provide outstanding performance under challenging conditions. Our emphasis has been on the development of compact, portable yet powerful pumps that can be utilised in a broad spectrum of applications. Our product differentiation is also the attention to detail that can make our products durable and efficient.
Cosmos Pumps do not simply sell you a machine. You receive someone who is an expert in providing solutions to your pumping problems. Get to know our CDW Series and find out how our innovation will make a difference.
At Cosmos Pumps, we offer quality and all forms of submersible mud pumps. Our durable, efficient and portable solutions ensure high performance by focusing on industrial, municipal and construction applications.
The pump flow rate is the volume of fluid that a pump can move in a given time period. The Flow rate (Q) can be measured in various units like – cubic meter/hour (m3/h), litre/minute (l/m), or gallons per minute (GPM).
A submersible dewatering pump is a pump that operates entirely underwater to remove groundwater, rainwater, or floodwater from construction sites, mines, municipal sites, infrastructure projects, and basements. Unlike surface pumps, it works while fully submerged, making it efficient for rapid water evacuation without the need for priming.
The motor and pump are sealed in a single waterproof housing. When switched on, the motor drives an impeller that creates centrifugal force, drawing water in through the bottom inlet and pushing it upward through a discharge pipe to the surface. Because the pump is already surrounded by the fluid it is moving, there is no suction lift requirement and no risk of cavitation from a dry start — provided the motor has thermal protection.
Not all submersible pumps handle the same fluid. Cosmos Pumps manufactures four distinct ranges of submersible dewatering pumps to cover the full spectrum of site conditions:
For full technical specifications, HP range, flow/head curves, and to request a quote, visit the Cosmos Pumps submersible dewatering pumps product range page.
Water is transported with the help of a pump. With a submersible pump, the device is encapsulated and dipped into the waste water, forcing the water to the surface with the help of interior impellers. It is perfect for deep drainage and industrial works.
Yes. Cosmos is a credible submersible pump manufacturer, and they produce waste water pumps, sewage, slurry and sludge pumps. This involves submersible dewatering pumps, sewage and Submersible Mud Pump used in various ways.
Dewatering removes:
Our submersible dewatering pumps handle all these efficiently.
Cosmos Pumps is among the top submersible pump manufacturers in India, offering:
Submersible sewage pumps handle soft solids and sludge in sewage water. It is perfect as far as municipal sewage systems, treatment plants and drainage systems are concerned.
The Pump head refers to the height that a pump can lift water. As the head increases, more water will reach a greater vertical distance because the pump can push it up. It is essential when choosing a submersible pump to consider applications in bottomless pits or high-rise buildings.
Delivery head refers to the vertical height between the pump outlet and the point of discharge. It can assist in acquiring the necessary pump capacity and energy consumption.
The pump flow rate is the quantity of water within a specific period; the rate is quantified in m 3 /hr, L/min, or GPM. Dewatering and mud pumps made and installed by us are available in several flow capacities.
It is an inverse relationship. When the flow increases, the head tends to decrease. The correct proportion would provide you with the best results with your pumping application.
The size of Cosmos Pumps is submersible between 2 and 16 inches, and as far as the flow is concerned, it is up to 5000m 3 /hr. The pumps serve different needs, such as light-duty and heavy industrial purposes.
Yes. We offer a range of submersible pumps with a capacity exceeding 1000m3/hr, designed for diverting large quantities of water in dewatering activities such as large-scale mining and industrial applications.
Every Cosmos Pump is supplied with 12 months of warranty provided by the manufacturer. There is the provision of extended coverage on services and warranty of long-term operations.
We provide:
As a reliable submersible pump supplier, our support ensures your systems stay running.
Yes. Cosmos Pumps holds the ISO 9001:2015 quality certification, ensuring its products meet international standards and undergo manufacturing processes of the highest quality.
Our manufacturing plant is based at Faridabad, India. From here, we serve clients across India and export to international markets, making us a go-to submersible pump manufacturer in India.