Your pump is working, but the hose to drain the water is missing. Or perhaps the current hose is kinking, leaking at the connection, or restricting the flow too much. To find the right replacement, start by noting the pump's reference number and the specifications of its outlet.
The hose must be compatible with the pumped liquid, the required flow rate, the pressure, and the device's connection. A hose chosen only because it seems to have the right diameter might limit the installation or prove to be incompatible.
Which drainage pump are we talking about?
The term covers several uses: draining clear water, emptying a reservoir, lifting dirty water, or transferring wastewater. These situations do not necessarily require the same equipment.
Take note of the liquid to be moved and any potential particles. A clear water pump does not become a wastewater pump simply by attaching a large hose. Solid passage and restrictions are specified in the device's manual.
In a water garden, also distinguish between occasional draining and permanent circulation to a filter or waterfall. Some drainage devices are designed for intermittent use. Choosing a hose will not fix a pump unsuited for long runtimes.
Information to note from the pump
Photograph the nameplate and the discharge outlet. If a removable nozzle is present, photograph it separately after turning off the device. Note the markings molded onto the part.
- Brand, model, and full reference of the pump.
- Type of outlet: threaded, barbed, or specific connection.
- Recommended diameter and accessories provided in the manual.
- Length of the path and the height between the pumped water and the discharge point.
- Nature of the water, temperature, and any particles.
With this information, the choice becomes much more reliable than with a photograph taken from a distance. Also, keep the original seals and fittings: they often help identify the intended assembly.
Inside hose diameter and threading: do not confuse them
For a flexible hose that fits onto a barbed section, the inside diameter is generally the data needed. The outside diameter includes the wall thickness and is not enough to select the nozzle.
Threads designated in inches follow a different convention. An outlet marked G1¼ does not mean that its outside diameter, measured with a caliper, is simply 31.75 mm. You must identify the type and size of the thread, then select the corresponding adapter.
The simplest method is to describe both sides of the connection: on the pump side, the connection provided by the manufacturer; on the hose side, the inside diameter of the hose. Also check the sealing method, such as a flat gasket when provided.
A narrower hose can significantly reduce flow rate
Water encounters resistance in the hose, elbows, valves, and fittings. These pressure drops add to the lift height. They explain why the actual flow rate is lower than the maximum flow rate announced for a pump.
A long and narrow path therefore requires special verification. Avoid adding a small garden fitting to the end of an installation designed for a high flow rate: this narrowing can become the limiting factor.
The diameter is chosen based on the manual and the expected operation. For a wastewater installation, flow velocity and the risk of deposits also come into play; have the entire network validated by a professional.
What length should I buy?
Measure the actual path, following the changes in direction. Add the length required for connections and for an installation without tension, then avoid unnecessary loops.
A pump placed three meters from the discharge point may require more hose if the path goes around a flowerbed or runs up a wall. Draw the path rather than measuring only the straight-line distance.
Check the unit of sale. Some hoses are sold by the linear meter, others in full rolls. A quantity of ten units could therefore mean ten meters on one sheet and ten rolls on another.
Which hoses are available on Aquishop?
The reinforced flexible PVC hose sold by the meter is available in several inside diameters: 20, 25, 32, 38, and 50 mm. Its product sheet indicates a working pressure of 6 bars and suitability for suction and discharge.
For a 38 mm requirement, the product sheet for the 38 mm reinforced flexible PVC hose also specifies sale by length. Check the selected variant and packaging before ordering.
The OASE 32 mm spiral hose in a 25 m roll corresponds to different packaging. The OASE reference 37177 is rated for a maximum pressure of 3 bars. These characteristics are not interchangeable with those of the previous hose.
For specific water or sanitary use, have the exact compatibility confirmed. The presence of a hose in the pond section does not prove its suitability for transporting any liquid.
Choosing the right fitting and clamp
A barbed nozzle must match the inside diameter of the hose. The clamp is then chosen based on the outside diameter of the hose once mounted on the nozzle and based on the conditions of use.
On some stepped fittings, the manual provides for removing smaller sections when the hose uses a larger section. Perform this operation only after identifying the correct step and confirming the instructions. A cut made too early renders the part unusable.
Do not compensate for a wrong diameter by overtightening. An poorly adapted hose or a crushed plastic fitting remains a fragile assembly. The seal on the threaded side must also follow the intended system, without improvised accumulation of gaskets and products.
Pressure, suction, and frost resistance
Check the permissible pressure of the entire line: hose, fittings, and accessories. The highest value listed on a single component does not represent the capacity of the entire assembly.
A hose intended for discharge is not automatically suitable for suction. On a surface pump, resistance to vacuum and the seal of this part of the circuit are essential. Look for an explicit indication on the product sheet.
Similarly, announced resistance to low temperatures does not mean a hose filled with water can freeze without damage. Prepare for wintering according to the manual and the drainage possibilities of the installation.
Check the assembly before walking away
Lay the hose without sharp kinks and protect it from edges or areas where it might be crushed. Keep the fittings accessible for the first checks.
After assembly, put the installation back into service according to the manual and watch for leaks, vibrations, and discharge flow. On a float pump, verify that the hose does not interfere with its movement. Cut the power before any correction or intervention in the water.
Finally, plan an appropriate destination for the drained water. Draining containing sludge or products is not decided like the transfer of clear water between two reservoirs.
Preparing your advice request
Send the pump reference, photos of the fitting, the length of the path, and the lift height to support@aquiflor.com. Specify whether you are looking for a temporary hose or a durable pipe.
Discover the diameters of the reinforced hose sold by the meter: a good purchase starts with the compatibility of the whole, then the length required for your installation.
Sources and references
- Aquishop product sheets for reinforced hoses and the OASE 37177 hose, linked in the article.
- OASE — Pond hoses and connectors.
- OASE — Diameters and pressures of the spiral hose range.
- OASE — ProMax ClearDrain 6000 manual: discharge connection and use.
- OASE — Understanding total dynamic head and pressure drops.
