The FPS Iguazu Sump 635 Twin is the two-pump version of our most popular station. It pairs a 190 litre high-grade MDPE chamber with two automatic AMA Drainer 301 submersible pumps, each with a maximum flow rate of 166 litres per minute and a maximum rated head of 6.5 metres.
The second pump is there for resilience: if one pump fails or is being serviced, the other continues to work. It is the option to choose where a failure would mean water ingress.
The same duties as the single Iguazu Sump 635: groundwater, light grey water from showers and hand basins, and flood water. Water enters through a perimeter channel, a 110mm pipe connection or the clear opening at the top, and the chamber can be drilled to allow groundwater in when installed externally. It is a common specification for Type C basement waterproofing, where continuity of pumping matters.
Not suitable for toilet waste. Suitable for grey water from showers and basins, but it must not be connected to a W.C. or foul drainage. For toilet waste, see our foul range: the Sump Foul, Foul Pro and FEKA.
Added pump resilience: The float switches can be set at different levels so that one pump operates as the primary pump. The second pump only activates if the water rises further because the first pump has failed or cannot cope with the incoming flow. This duty-and-assist arrangement provides additional pumping capacity and system redundancy, helping to reduce the risk of flooding caused by a single pump failure or unusually heavy water ingress.
Where both pumps run together the combined output is up to 332 litres per minute. Note that a battery backup supports one pump only; two systems are needed to back up both.
Each AMA Drainer 301 has a maximum flow rate of 166 litres per minute and a maximum rated head of 6.5 metres, so the pair can move up to 332 litres per minute when both run together.
These are the two ends of the pump curve rather than a single duty point: at 6.5 metres the flow has fallen to zero, and the full 166 litres per minute is only available with no lift at all. What you actually get sits between the two, where the curve meets the resistance of your pipework. Our pump performance calculator works that out for your pipe run, and how to read a pump curve explains the principle.
Understanding flow rate: To put a pump’s flow rate into perspective, a typical outside tap delivers around 10 to 15 litres of water per minute. A pump rated at 100 litres per minute could therefore move roughly the same volume of water as 7 to 10 outside taps running at once.
As with the single 635, the value here is that the pumps are well matched to the chamber rather than oversized. Staggering the on levels means the second pump only starts when the level keeps rising, which avoids both pumps short cycling on a small inflow. Each pump draws 0.43 kW (P1) for a 0.18 kW (P2) motor output. Full pump detail is on the AMA Drainer 301 product page.
Full pump performance figures are in the specification table further down this page.
Can be installed internally or externally depending on site requirements.
The chamber should be installed on a concrete bed and surrounded with concrete to prevent flotation and movement. Depending on the desired installation, these chambers are often connected with fixed PVC delivery pipe, or with suction and delivery hose, matched to the outlet size. The chamber outlet terminates in a 1¼ inch male thread and discharges through 32mm pipework, so use 32mm rigid pipe and fittings secured with solvent weld, or suction and delivery hose. The hose option is made up from three parts: a hose tail, the hose, and a hose clip.
When installed internally, the chamber would usually be fitted with a recessed, sealed lid, allowing the surrounding floor finish to be continued across it while helping to contain odours and moisture.
Supplied as a complete plug and play unit, ready for installation. Some on-site work is required, including reconnecting components, drilling entry holes for cables and routing wiring through a suitable conduit. Read our guide to installing a sump pump.
Images are indicative only. Photographs may show optional extras, accessories or pipework that are not included in this listing, and the chamber is shown cut open in some images to reveal the internal components. Your chamber is supplied whole.
Pump station design and installation is site specific. You should always consult a suitably qualified engineer to determine the correct configuration and installation method for your application, and a qualified electrician for the electrical connection.
We supply equipment. We do not provide site-specific design or installation advice over the phone, because the correct configuration depends on levels, flows, ground conditions and the discharge route. Where a project needs calculations, a specification or a design, see our engineering review service.
| Model | AMA Drainer 301 |
| Manual/ Auto | A |
| Outlet/ mm | 32 |
| Kw | 0.43 |
| Volt | 230 |
| Flow ltr/min | 166 |
| Head /m | 6.5 |
| On Level/ mm | 145 |
| Off Level/ mm | 70 |
| Free Passage | 10 |
| W x L x H /mm | 340 x 330 (switch extended) |
| Weight /Kg | 4.5 |
Watch below as we install a Packaged Pump Station into a garage floor, to assist with removing any floodwater that may enter.
In this instance, the property was suffering some water ingress into the garage through the walls, and also through a non-FPS Flood barrier.
The Sump Pump was installed into the garage floor to provide a passive solution to remove water from the garage.
In this video, we showcase how a sump pump operates to protect a small patio area surrounded by a low wall and flood barriers. Despite these precautions, rainwater, roof runoff, and groundwater can still lead to pooling.
