Trash Pumps
Trash pumps — engine-driven, self-priming pumps built for heavily contaminated water carrying sand, silt, gravel and solids that would clog or destroy a clean-water pump. Because they run on petrol, they work where there is no power supply: in excavations, flooded basements, construction-site dewatering and flood recovery.
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The TA-HLS series comes in three sizes, selected by port diameter and by the size of solids the machine will pass: 50 mm (2") — 656 l/min and solids up to 15 mm, 80 mm (3") — 1,252 l/min and up to 27 mm, 100 mm (4") — 1,647 l/min and up to 27 mm. Each is driven by a genuine Honda GX-series engine. For continuous unattended work in a sump or below the water line, see submersible sludge and sewage pumps.
Size follows port diameter: 2" for dewatering a house foundation, 3" and 4" for construction sites and flood clearance. Clean water under pressure calls for a different machine — see booster pumps.
Where a trash pump works
Excavation and site dewatering
Groundwater entering an excavation carries sand and fine gravel that would wear out a clean-water impeller within hours. A trash pump runs the clearance between impeller and casing sized for solids, so it keeps working in that slurry without stopping to clear blockages. On a strip-foundation excavation, the 80 mm model at 1,252 l/min holds the bottom dry wherever inflow stays below 75 m³ per hour.
Flood recovery
After a hall, basement or garage floods, two things matter: speed, and the fact that the water is dirty — it carries silt, leaves and lumps of plaster. The 100 mm model moves 1,647 l/min, close to 99 m³ per hour, and passes solids up to 27 mm. The limiting factor is suction lift: the pump stands outside and will draw liquid from no more than 8 m below its own level.
Transfer work away from mains power
A petrol engine makes the machine independent of a power supply — the main advantage over submersible pumps, which need electricity. A total head of 26.3–29.1 m allows water to be pushed up to a higher floor or to a discharge point tens of metres away, provided the delivery hose is sized correctly.
Toolsa TA-HLS trash pump specifications
| Model | Port | Flow rate | Max. solids | Total head | Engine | Weight |
|---|---|---|---|---|---|---|
| TA-HLS50 | 50 mm (2") | 656 l/min | 15 mm | 27.1 m | Honda GX160 · 163 cm³ · 4.8 hp | 41 kg |
| TA-HLS80 | 80 mm (3") | 1,252 l/min | 27 mm | 26.3 m | Honda GX270 · 270 cm³ · 8 hp | 63 kg |
| TA-HLS100 | 100 mm (4") | 1,647 l/min | 27 mm | 29.1 m | Honda GX390 · 389 cm³ · 11 hp | 82 kg |
All three models run at a working speed of 3,600 rpm and prime from up to 8 m. Overall dimensions grow with size, from 610 × 485 × 480 mm on the TA-HLS50 to 735 × 570 × 600 mm on the TA-HLS100.
Choosing the size
Two things decide: how fast the water arrives, and what is floating in it. Match flow rate to inflow rather than to the volume you need to remove — seepage into an excavation is handled by 656 l/min, active drainage calls for 1,252 l/min, and 1,647 l/min is what you reach for in a flood or a burst. The second criterion is maximum solids size: the TA-HLS50 passes solids up to 15 mm, which covers silt, sand and fine suspension, while the TA-HLS80 and TA-HLS100 handle rubble and stones up to 27 mm. The third is weight: 41 kg is a two-person carry, 82 kg needs a trolley. Hoses, couplings and strainers are matched to the port size — see pump hoses and accessories.
Frequently asked questions
What is a trash pump used for?
A trash pump moves heavily contaminated water containing sand, silt, gravel and small rubble. It is driven by a petrol engine, so it works with no mains supply: in excavations, in site dewatering, in flood recovery and when transferring liquid out of tanks. TA-HLS models move between 656 and 1,647 l/min, deliver a head of 26.3–29.1 m and pass solids up to 15 or 27 mm depending on size. What separates a trash pump from a clean-water pump is the design of the wet end, not the size of the engine.
How does a trash pump differ from a clean-water pump?
The difference is in the wet end. A trash pump runs a wider clearance between impeller and casing, which is what lets solids of 15 mm in the 2" class and 27 mm in the 3" and 4" classes pass through instead of jamming, and its wear parts are made thicker. A clean-water pump uses tight clearances to build pressure, and in slurry it will either clog or wear out within hours. The price of that durability is lower pressure for the same engine output: 26–30 m of head rather than the several dozen metres typical of high-pressure pumps.
What flow rate should I choose?
Size the flow rate against inflow, not against the volume to be removed. The pump must keep pace with the water arriving, or the level will not fall regardless of running time. Seepage into a foundation excavation is covered by 656 l/min (39 m³/h); larger areas with active drainage need 1,252 l/min (75 m³/h); and 1,647 l/min (99 m³/h) is for floods and burst mains. Catalogue flow rates are quoted at zero head — pumping to 15 m will give a noticeably lower real throughput.
How large a solid will a trash pump pass?
Maximum solids diameter is the single most important selection criterion, and it does not follow from port size. The TA-HLS50 with a 50 mm port passes solids up to 15 mm — silt, sand and fine suspension. The TA-HLS80 and TA-HLS100, despite 80 and 100 mm ports, both pass up to 27 mm, because the limit is set by impeller clearance rather than by the connection. Water carrying larger rubble or stones needs a strainer with a suitable mesh — otherwise the pump draws in something it cannot pass, and the casing has to come apart.
What do the 2", 3" and 4" port sizes mean?
The port is the diameter of the suction and delivery connection: 2" equals 50 mm, 3" is 80 mm and 4" is 100 mm. Port size governs flow rate above all — from 656 l/min at 2" to 1,647 l/min at 4". Hoses, couplings, strainers and gaskets must match that size: a narrower hose throttles the pump and cuts output, even when a reducer makes it physically possible to connect.
Why does suction lift stop at 8 metres?
A pump does not suck water up; atmospheric pressure pushes it once the pump creates a vacuum. At sea level, the column of water matching atmospheric pressure is about 10.3 m, and no pump can beat that theoretical limit. In practice, suction hose losses, air leaks and vapour pressure consume the rest, so real suction lift is 7–8 m — which is what the TA-HLS models are rated for. If the water surface sits lower than that, move the pump closer to it or use a submersible pump.
Can a trash pump handle slurry or septic tank contents?
A trash pump is designed for water carrying mineral solids — sand, silt, gravel and rubble up to 27 mm. Thick, fibrous and chemically aggressive liquids are a different job: fibres wrap around the impeller and pH accelerates corrosion of the wet end. For domestic sewage and continuous work in a sump, use submersible sludge and sewage pumps, which run submerged and need neither priming nor attendance between cycles.
What has to be done before the first start?
The pump casing must be filled with water. A self-priming pump needs liquid in the chamber to create a vacuum, and running dry destroys the mechanical seal within seconds. Beyond that: check the oil level in the Honda GX engine, fill the tank, fit the suction hose with strainer and foot valve, and make sure every joint on the suction side is airtight. A leak on the suction side is the most common reason a pump fails to prime — at a vacuum equal to 8 m of water column, one loose coupling is enough to stop it drawing.
Which parts wear out fastest?
The parts in contact with the slurry go first: the impeller and wear plate, followed by the mechanical seal and the port gaskets. Wear rate follows sand content — the same machine will last several times longer on clean water than dewatering an excavation in sandy ground. After any work in slurry, flush the pump with clean water for half a minute and drain the casing before transport, particularly below 0 °C. A worn impeller shows up as falling flow rate and head at the same 3,600 rpm.