Cobalt Range 400AR Submersible Pumps

From £8,140.00

Rotorflush Cobalt 400AR filterpumps are industrial filterpumps, suitable for mining, quarrying and heavy industrial applications.

Their 400mm diameter stainless steel self-cleaning intake screen can be manufactured from 304 or 316 stainless steel.  The powerful three phase motors have a thermal cutout  and the intake screens are available in a range of mesh sizes.

These filter pumps offer fine or coarse filtration while pumping up to 1000 litres a minute and provide the same low maintenance and efficient intake screening of all our submersible filterpumps.

The Cobalt range of filterpumps use Rotorflush's unique self-cleaning intake filter technology. They deliver an uninterrupted supply of water while a continuous backwash keeps the intake, pump and other downstream equipment blockage free.

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Key Features

  • Stainless steel motor casing
  • Stainless steel intake and filter mesh
  • Chromium iron pump impeller
  • Internal overload monitoring (thermal cutout)
  • Pump and filter in one unit, screening from 315 microns to 3 mm
  • 60 cubic metres per hour maximum flow
  • EA Eel Regulation compliant up to 32 m3 / hour (fitted with 2 mm mesh)
  • 25m depth maximum operating depth
  • Reduced capital, installation and maintenance

Cobalt Range 400AR Submersible Pumps

Models & Specification

Cobalt Range 400AR Submersible Pumps with Built-in Self-cleaning Intake Screens – 1000 litres minute

The Cobalt Range 400AR filterpumps are a range of industrial low to medium pressure submersible pumps with integral self-cleaning suction intake screens.  These filterpumps benefit from a cast iron upper cover, a strengthened AIS1304SS motor case and a 400mm stainless steel self-cleaning intake, capable of delivering up to 1000 litres minute of filtered water.  They combine pumping and screening and are ideal for use in difficult and dirty water.

Cobalt Range 400AR filterpumps have self-cleaning intakes to prevent debris entering the pump and keep debris off the filter screen. They can be fitted with a range of mesh sizes:

  • 115 or 300 micron nylon filter mesh
  • 100 or 315 micron stainless steel sintered filter mesh
  • 1mm or 2mm woven stainless steel mesh
  • 3mm perforated steel mesh.


Stainless steel mesh is ideal for more challenging environments. Cobalt 400AR filterpumps are suitable for heavy duty use and can also be fitted with 316 stainless steel self-cleaning intakes.


Performance and Power – Cobalt 400AR Filterpumps

 Cobalt Model Volts Hz* Output kW Rated Current Amps Outlet mm
Max m3 / hr Max Head (metres) Manual or Auto Phase
CKC31.5 400AR 400 50 1.5 4.0 75mm 53 18 Manual Three
CKC32.2 400AR 400 50 2.2 5.5 75 mm 60 22 Manual Three
CKC42.2 400AR 400 50 2.2 5.5 100 mm 60 19.5 Manual Three

*60 Hz versions may be available – please ask.

Please note as standard these filterpumps are fitted with 8 m cable – longer cable can be fitted, please ask.

Cobalt 400's being pressure washed after testing.

Cobalt 400 filterpumps after testing.

Cobalt Range submersible pumps have three phase motors and are fitted with self-cleaning suction intake screens.

NB: It is very important that three phase motor filterpumps are connected to their power source correctly, to ensure that the pump motor runs in the right direction. When pumps run backwards they are inefficient and the motor may be damaged. To see how to test that the pump is wired correctly watch this video.

Please note that we strongly recommend the use of Control Panels and / or a Din Rail mounted Cos Phi Load Monitor with all 3 phase models to prevent damage to pumps.

Installing adequate load monitoring is a condition of our guarantee for these products.

Performance Curves for Cobalt 400AR Filterpumps (click images to enlarge)

Performance curve for submersible pump that doesn't block up thanks to 400mm self-cleaning filter for pumping dirty water
Performance curve for Rotorflush Cobalt CKC 3.2.2 kW Submersible pump with integral self-cleaning intake for use in dirty water
Performance curve for Rotorflush Cobalt CKC 1.2.2 kW Submersible self-cleaning intake water pump for use in dirty water



Dimensions – Cobalt 400AR Filterpumps

Approximate Dimensions CKC31.5-400AR CKC32.2-400AR CKC42.2-400AR
H1 Total Height mm 745 745 765
F Filter Height mm All Models 270
D Filter Diameter mm All Models 420
D1 Pump Diameter mm All Models 262
W Min Depth mm All Models 400
Outlet mm
75mm male 75mm male 100mm male
Dry Weight (Kg) 60 63 63

Pump Shown Cobalt CKC45.5

Self Cleaning Intake Filter Construction

Cool filter meshes available from Rotorflush for filterpump self-cleaning intakes


Filter screen area 2500 cm2
Screen sizes standard 300 micron, 315 micron, 1mm, 2mm, and 3mm
Screen material Nylon mesh, polypropylene insert (300 micron)
Sintered stainless steel mesh (315 micron)
Stainless steel woven mesh (1mm and 2mm)
Stainless steel perforated mesh (3mm)
Impeller extension shaft Stainless Steel
Impeller Stainless steel
Rotor ABS  (Acrylonitrile Butadiene Styrene)
Rotor Bearings Silicon Carbide
Filter cage Stainless Steel
Cleaning Jets Natural Rubber Jets,  stainless steel clips

Rotorflush filterpumps work best with good clearance all around the self-cleaning intake filter.

We can fit stands to suit.



Please Note: Our filters are designed for use in dirty water or liquids with a viscosity close to that of water. Our filters and filterpumps are NOT suitable for use in raw sewage or any other dirty water which contains oils or fat.



Cobalt 400AR Submersible Pumps from 600 to 1000 litres / min

Submersible pumps with integral self-cleaning suction intake filters (three phase 415v 50Hz) 
Cobalt Model No. Prices
CKC31.5 400AR


CKC32.2 400AR £8,185.00
CKC42.2 400AR £8,190.00
All prices are exc. of VAT and Carriage

Please note:

All our products are manufactured to order.

Delivery is by carrier.  Contact us for latest lead times.

Carriage and packing charges are extra.

Contact us – use this form or call 0044 (0)1297 560229

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    Below is the technical and maintenance information for the Cobalt Range 400AR Submersible Pumps

    ...Frequently Asked Questions

    We know you'll have plenty of questions about how things work, what kind of questions to ask us and what we'll ask you. We also have downloadable information across the range of our products as well as a specific information on Filtration Knowledge.

    Read the FAQs