Author Archives: Maris Pumps

205 Litre (45 Gal) Drums of Diesel For Sale

Drum of DieselMaris Pumps is pleased to announce that we now have for sale 205 litre drums of red diesel.

Have an emergency requirement? Need it now? Contact us on 01246 201111.

We pride ourselves our rapid response times – no longer wait for days for your current supplier – we aim to deliver within 2 hours of your initial call!

Diesel can be delivered with your pump hire or at any time during the period of work.

All drums transported in UN approved containers.

Why you probably need a settlement tank with your hire pump

Settlement tanks are increasingly becoming a necessity on many sites where environmental considerations need to be taken. They offer a degree of protection, ensuring that oil, silts and fines are not discharged back in the watercourse.

The Environment Agency’s Pollution Prevention Guidelines PPG6 states that:

Surface waters and groundwater have legal protection. It is an offence to pollute them.

Silt and oil are the most common construction site pollutants to water. Your site doesn’t need to be next to a river to cause a problem; any pollutants getting into drains can end up in a river even if it’s miles away from site, and can be traced back to their source. Drainage systems, including land drains, act as unseen pathways. If your site is near surface waters or drainage connection leading to surface waters, you’ll need to take extra care to manage your site activities to reduce the risk of pollution.

A settlement tank typically has a number of internal baffle plates or wiers which reduce the flow velocity allowing suspended particles to settle out. Since oil floats on water the baffles can be constructed in such a way that the water flows under the plate, leaving the oil trapped behind the first baffle.

The illustration below shows the flow of water through the settlement tank – entering at the top, the water then flow under the first baffle, leaving any oil floating on top and trapped in this first section, then flows over a v-notch in the second baffle before being discharged.

Illustration of settlement tank showing flow of water

Maris Pumps offer a range of settlement tanks for hire.

What is a submersible pump float switch and which type do I need?

When researching which submersible pump to buy, you will inevitably see pumps which are available with numerous types of float switch, here we’ll describe their operation and two of the most common types.

Mac-3 Pendant type Float SwitchA float switch is a mechanism used to detect the level of water around a submersible pump, allowing the pump to operate automatically – when the water reaches a certain pre-set depth the float switch will trigger the pump to switch on and start pumping. When the water level drops below another pre-set level, the pump will then be turned off automatically and stops pumping.

This automatic operation ensures that the pump will never “run-dry”. The electric motor in a submersible pump is normally water cooled – the action of pumping the water through the pump body keeps the electric motor within normal operating temperatures – when there is no water present, the pump could run-dry and overheat, cause damage to the motor.

Operation of a pendant type float switch in a sump

The submersible pumps we stock can be supplied with a float switch for automatic operation, or without a float switch for manual operation.

For most of our pump range, there are two options for the type of float switch: a free-moving float attached to the pump via an electrical cable, or a tube float which is normally mounted on the side of the submersible pump.

Free-Moving Pendant type Float Switch

JS-250 Submerisble Pump with Mac-3 Pendant Float SwitchThe standard option is the free-moving pendant float – these are generally manufactured from tough polypropylene plastic with a micro-switch mechanism inside. When there is sufficient depth of water the air-filled bulb will float upwards, triggering the micro-switch to power up the pump. When the water has been pumped away and the level decreases, the float will drop, switching the pump off again. This type of float switch generally requires the submersible pump to be installed in a tank or sump and needs approximately 300 mm of space around the pump to operate properly. This ensures the float doesn’t get snagged or tangled on the sump or tank walls.

Tube-type Magnetic Float Switch

RS-150 Submersible Pump with Agma Magnetic Tube Float SwitchThe second option is the tube-type, or magnetic float switch. This is close-coupled to the pump body and has a float which slides vertically inside a tube – when the float is at the top of the tube, a micro-switch turns the pump on and when the float drops to the bottom, the pump is switched off. This type of float switch is ideal for installing pumps is space-limited areas, where a standard float switch wouldn’t have room to operate.


When purchasing a submersible pump keep in mind the intended use: a manual submersible pump will require you to switch it on and off when required. A submersible pump with a tube type float is ideal for automatic operation in small sumps, and the standard bulb, free-moving pendant float switch is suitable for most other applications requiring an automatic operation.

Rapid Response Pump Hire for the Environment Agency


Blithfield Reservoir in Staffordshire recently played host to a training day held by the Environment Agency in order to measure emergency response times to aid in future flood alleviation plans.

Maris Pumps Ltd, partnered with the Environment Agency,  received an emergency call to mobilise pumping equipment including a 12” high flow pump and associated pipework to the reservoir and quickly deployed 2 HGV’s to the site.

Upon arrival, and after performing risk assessments and following appropriate health and safety procedures, Maris Pumps’ engineers swiftly set up the 12” high flow Pegson VS200HF in a prime position whilst being timed by Environment Agency staff. To mitigate against any potential environmental contamination, the pump was setup with a drip tray and emergency spill kits were on hand.


Felix Chigama, FCRM Advisor at the Environment Agency, commented on the quick response, efficient setup and environmental awareness of service provided Maris Pumps and on the overall success of the training day.

12in-PumpSee our full range of pump hire equipment.

Maris Pumps Invests in the Future

Maris Pumps are an ISO 14001 Registered CompanyFollowing on from implementing the ISO 9001:2008 Quality Management System in 2012, we are pleased to announce our further committed to our environmental policy by adopting the ISO 14001 Environmental Management System.

The system will increase our operational efficiency by managing environmental responsibilities, and deliver enhanced service to our customers.

We are also undergoing a period of continued expansion,  which has lead to increasing our pump hire fleet by over 25% since the start of 2013 (we probably have the largest single-depot fleet in the UK!), and creating new jobs for drivers, fitters and engineers. So, whatever your pump hire requirements, we’ve got it covered!

How to Keep Your Cellar or Basement Dry

One of our most frequently asked questions is “what’s best pump to deal with cellars/basements that periodically get flooded out?” Typically, the flooding occurs after heavy rainfall, if the water table is high or if you live in close proximity to a river/lake. The solution is a submersible pump.

Submersible Pumps

Pedrollo TOP Submersible PumpFor this type of application, we would normally recommend a submersible pump – a small electric pump, which can be completely (or partially) submerged underwater. The pump sucks the water through a strainer in its base and pumps it from the outlet (normally located on the top of the pump) through a hose to a suitable discharge point (the nearest drain or similar).

For ease of use, most submersible pumps are available with a float switch (it’s the round, black and orange part of the pump in the photo) – this a similar to a ballcock in a toilet cistern – when water is present it floats up and turns the pump on, when the water has drained away the float drops down and turns the pump off. This allows for automatic operation, meaning the user doesn’t have to manually turn the pump on and off when the water rises. However, submersible pumps with float switches work best when installed in a sump (essentially a hole dug in the floor) and need to be of a suitable size to allow the float switch to move freely (typically around 400 mm x 400 mm x 400 mm). They will usually only drain water down to a level of a few inches.

Puddle Pumps

RS-Pumps RSD-400 Submersible Puddle PumpIf you prefer not to dig a sump, we can offer an alternative – a puddle pump. These low-level drainage pumps are engineered to pump water from flat surfaces down to around 1 mm deep (hence the name!), and are ideal for cellars, basements, car parks and flat roofs.

Due to their low-level performance, puddle pumps are not supplied with a float switch and as such are normally manually operated.

For fixed installations, such as keeping your cellar/basement dry, we would recommend using an automatic control panel which uses a sensor to detect the presence of water and operate the pump.

For other applications, such as drainage of persistent nuisance water from areas such as flat roofs and car-parks  puddle pumps are best manually operated and can be used like a vacuum cleaner to “hoover” up the water – you can even sweep the water into the pump to help it drain away!

Our Submersible Pump Recommendation

Our most popular submersible pump for domestic drainage is the Pedrollo TOP range, these lightweight yet robust pumps are available in a number of different sizes, each offering improved performance (the bigger the electric motor, the faster is will drain the water away).

Pedrollo also offer a puddle pump, the TOP Floor which drains down to 2-3mm, but our most popular model is the JS-Pumps RSD-400. This stainless steel-bodied pump provides excellent performance and superior low-level drainage.

Which Pump Hose Do I Need?

Layflat Hose

Layflat HoseLayflat is lightweight and convenient hose which rolls flat when not in use.

It is quick to deploy and ideally suited for use as short runs (say 50 m) of delivery hose. The pressure of the water in the hose holds it open and therefore may cause greater friction losses than rigid pipe of the same internal diameter.

Can be used across roads and will accept light traffic driving over it (although pin-hole leaks may occur). For a better solution, see our Road Ramp.

It is not suitable for use as suction hose.

Available in various inside diameters such as 25 mm (1″), 32 mm (1¼”), 38 mm (1½”), 51 mm (2″), 76 mm (3″), 102 mm (4″) & 152 mm (6″). Sizes 51 mm (2”) and up are available with bauer compatible couplings.

Rigid Plastic Polypipe

Polypipe Rigid Delivery HoseA rigid yet lightweight hose ideally suited for use on the delivery side of the pump.

Polypipe is ideally suited to longer runs or semi-permanent installations.

It is supplied in 3”, 4”, 6” and 8” internal diameters in 6 m (20 ft) “sticks” with bauer compatible quick release couplings.

Wire Armoured Hose

Wire Armoured Rubber Suction & Delivery HoseA very durable wire reinforced rubber hose fitted with Bauer couplings.

Wire Armoured Hose is ideal for use on the inlet side of the pump as it won’t collapse under suction, although can be used as delivery hose as well.

Wire Armoured Hose is available in 3”, 4”, 6” and 8” internal diameters in 3m (10 ft) or 6 m (20 ft) lengths.

Green Medium Duty Hose (“Kanaflex”)

Green Medium Duty Suction and Delivery HoseThis is a general purpose, lightweight PVC spiral/corrugated hose ideal for use as suction and delivery hose.

It is flexible, hardwearing and cost-effective making it a suitable alternative to Wire Armoured Hose for smaller pumps and lighter applications.

Green Medium Duty Suction and Delivery Hose is available in a range of inside diameters such as 25 mm (1″), 32 mm (1¼”), 38 mm (1½”), 51 mm (2″), 76 mm (3″), 102 mm (4″) & 152 mm (6″) and in lengths up to 30 m (100 ft). It is available as hose, or as an assembly with bauer-compatible couplings.

What is the difference between a Puddle Pump and a Submersible Pump?

A submersible pump is usually a small electric pump used for drainage duties. As the name implies, the whole pump can be submerged under water – in most cases this is necessary to keep the electric motor cool and prevent overheating.

Submersible Pumps

Submersible pumps can be manually or automatically operated. Manual pumps require the user to switch the pump on when required and off when the water has drained away (dry-running of a submersible pump will normally cause damage to its internals). Automatically operated pumps have a float switch (similar to a ball-cock in a toilet cistern) which switches the pump on and off at pre-set water levels. Submersible pumps with float switches usually require a certain amount of space around the float for it to operate and these work best in tanks or for drainage of cellars/basements in a sump (essentially a hole dug into the floor where water collects).

Submersible pumps will typically drain water down to a level of approximately 30 mm.

A popular example of a domestic-use submersible pump is the Pedrollo TOP range – you can see in the diagram below a typical installation in a sump, with sufficient space for the float to operate unobstructed.

Pedrollo TOP Submersible Pump installation in a sump

Puddle Pumps / Puddle Suckers

Puddle Pumps (also known as Puddle Suckers) are submersible pumps with the ability to drain down to very low levels (typically as low as  1mm, and so can be fully or partially submerged). They are usually manually operated (no float switch) and are ideal for draining water from flat surfaces such as roofs, car-parks and cellars.

Puddle Pump in Cellar

Automatic operation is an option for some puddle pumps in fixed installations through the use of a capacitive water sensor and control unit.


A Puddle Pump is really just a type of submersible pump with a specifically designed impeller and strainer to allow for low-level drainage applications on flat surfaces.

Our two best-selling puddle pumps are the Pedrollo TOP Floor, which pumps down to 2mm and is ideal for domestic drainage duties, and the RSD-400 Puddle Pump, a higher performance pump which drains down to 1mm and due to its stainless steel construction is suitable for domestic and on-site drainage.

See our full range of submersible pumps.