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Pump to empty a paddling pool or hot tub

Updated: 22 October 2026

You are packing down a paddling pool after a hot weekend, or winterising a hot tub, and buckets are already a joke — yet a random garden hose siphon still leaves a cold lake on the liner. A flat suction pump is the usual UK amazon.co.uk answer for leisure empties that need a thin residual film rather than centimetres of standing water. This page covers clean versus Dual choice, liner protection, continuous-mode finishing and discharge sense-checks. Open the [flat suction pump comparison](/hub/garden-watering/flat-suction-pump) for the ASIN table. A purchase through our links may earn us a commission at no extra cost to you. Peter F., editor for DIY & tools, updated this on 22 October 2026.

You are packing down a paddling pool after a hot weekend, or winterising a hot tub, and buckets are already a joke — yet a random garden hose siphon still leaves a cold lake on the liner.

Our top picks

Einhell Einhell GC-SP 3580 LL

Best overall

Einhell Einhell GC-SP 3580 LL
9.0/10about £47.99
View offer
Einhell Einhell GE-DP 7035 LL

Rank 2

Einhell Einhell GE-DP 7035 LL
8.8/10about £68.98
View offer
VEATON VEATON FSP750C-A

Alternative

VEATON VEATON FSP750C-A
8.0/10about £69.99
View offer
On this page
  1. 1.Why flat suction suits pools and spas
  2. 2.Choosing clean versus Dual for leisure water
  3. 3.Protecting liners and finishing the last film
  4. 4.Time, hose and discharge sense-checks

Why flat suction suits pools and spas

Paddling pools and many hot tubs sit on soft bases where an ordinary float cuts out early. Flat suction listings claim residual water down to about 1 mm so you can wipe the liner. That claim only lands in continuous or locked-float mode. UK Einhell clear reviews treat clipping the float as normal for the last stage. Auto mode alone will not wipe a spa dry. Headline litres per hour assume near-zero head and a proper hose. A narrow hose, a kink or a long lift stretches the job. Hose is almost never in the box in this set, so buy pipe and clips with the pump.

Choosing clean versus Dual for leisure water

If the water is mainly clear, a clean-water flat pump is the efficient pick. The Einhell 350 W clear listing around £48 is the leisure value role: a thick UK review file, 8,000 L/h and a 1 mm claim, if you fit a wide hose and finish in continuous mode. Skip it when sand, gravel or leaf mulch will jam a clean impeller. If the pool sits under trees, or you also drain a muddy pond, a Dual makes more sense. Einhell GE-DP 7035 LL and Kärcher SP 16.000 Dual claim 35 mm and 20 mm dirty passage plus a flat mode. Use dirty mode while silt moves, then flat pick-up on a hard support. Roles sit on the best flat suction pump page, and solids on clean vs dirty flat suction.
Einhell Einhell GC-SP 3580 LL

Testsieger

Einhell Einhell GC-SP 3580 LL
9.0/10about £47.99
View offer

Protecting liners and finishing the last film

Soft PVC can seal over a bottom inlet. UK reviews include pumps sticking to pool floors and at least one torn-liner report. Place the pump on a metal grid, tile or board, and keep it off the deepest crease until the level drops. Attach the hose and clip before you lower the pump. Lost outlet clips in murky spa water are a Dual headache. Start in float-auto for the deep phase, then clip the float for the last film and stay present. If flow collapses, lift the pump. Do not keep pulling against a sealed liner. Float and RCD practice sits on how to use a flat suction pump.

Time, hose and discharge sense-checks

A small paddling pool on a short wide hose can empty in a modest session. A deep hot tub over a patio sill on a thin hose takes much longer. One UK review describes a hot tub that felt like a multi-day job when the setup was wrong. That is a hose and mode warning, not a timetable. The clear Einhell cable highlight is about 5 m, the dual Einhell about 10 m, and VEATON 8 m. Use an outdoor-rated extension on an RCD if the socket is short. Do not send chlorinated water onto a neighbour's bed or into a storm drain you may not use. Prefer a permitted drain or a soakaway on your own ground. This page is not legal advice.

Common questions

Will it empty a paddling pool nearly dry?
Yes in continuous flat mode on a suitable base with a wide hose, leaving a wipeable film rather than a deep puddle. Float-auto alone usually stops earlier. Soft liners still need a grid so the inlet does not seal.
Will suction damage a soft liner?
It can, if the bottom inlet seals onto PVC. Raise the pump on a grid or board and never leave continuous mode pulling against a stuck liner. Lift it as soon as flow collapses.
Clean or Dual for a leafy pool?
Dual if leaves and silt are significant. Clean flat if the water stays clear. Run dirty mode first on Duals, then flat for the finish on a hard support.
How long might a hot tub take?
It depends on volume, lift and hose. Expect longer runs when head is high or the hose is narrow. Fix hose and mode before you blame the pump’s watt rating. There is no single minutes-per-litre figure that fits every tub.
Where can I discharge the water?
Only where you are allowed, typically your own soakaway or a permitted drain. Do not assume storm drains or neighbouring land are free sinks for chemically treated spa water. This is not legal advice.
Is the hose included?
Rarely in this set. Budget for hose and clips with the pump. Clear and Dual reviewers both treat a missing hose as normal. A narrow garden hose throttles the headline flow.
What cord length suits a garden socket?
Check the listing: about 5 m on the clear Einhell highlight, about 10 m on the Dual Einhell highlight, and 8 m on VEATON. Use an outdoor-rated extension on an RCD when the socket is short.

Related pages

Flat suction pump buying guide

Flat suction pump

Best flat suction pump UK: mixed jobs or clear water

Clean vs dirty water submersible pump: which to buy

How to use a flat suction pump: hose, float and RCD

Sources

Public UK sources and the saved amazon.co.uk listings for this set, checked on 21 October 2026.

  1. Kärcher GB submersible pumps overview (retrieved 21.10.2026)
  2. Electrical Equipment (Safety) Regulations 2016 (Great Britain) (retrieved 21.10.2026)
  3. Business Companion: electrical equipment (retrieved 21.10.2026)
  4. Electrical Safety First: garden advice (retrieved 21.10.2026)
  5. HSE: electrically powered equipment (retrieved 21.10.2026)
  6. Flood and Water Pumps: solids handling explained (retrieved 21.10.2026)
  7. Consumer Rights Act 2015 (retrieved 21.10.2026)
  8. Which?: faulty goods advice (retrieved 21.10.2026)