Charles Austen DS Water Pumps
Bottom-intake compact pumps that can drain tanks and reservoirs to a low level
DS pumps are built around a simple useful feature: the intake is at the bottom, allowing a tank or hydroponic reservoir to be drained far lower than with many side-intake pumps. The range spans 850 to 4,800 l/h, so it covers everything from a small nutrient tank to a larger transfer duty.
Charles Austen describes the range as suitable for submersible or external use and provides an easy-open cover for rotor and impeller cleaning. For external installation it still needs a flooded, correctly plumbed arrangement; it is not a self-priming suction pump.
The DS700 and DS1000 are genuinely small. DS3000, DS4000 and DS5000 provide the more useful head for elevated returns.
Model Comparison
| Model | Maximum flow | Maximum head | Power |
|---|---|---|---|
| DS700 | 850 l/h | 1.1 m | 9 W |
| DS1000 | 1,290 l/h | 1.7 m | 20 W |
| DS2000 | 1,920 l/h | 2.0 m | 30 W |
| DS3000 | 3,000 l/h | 2.6 m | 60 W |
| DS4000 | 4,000 l/h | 3.5 m | 80 W |
| DS5000 | 4,800 l/h | 4.0 m | 105 W |
Maximum figures are comparison points measured under favourable conditions. Delivered flow falls as head and system resistance increase.
Why bottom intake is useful
In propagation, aquarium maintenance and nutrient reservoirs, leaving the final few centimetres can be awkward. The DS intake draws close to the base, reducing manual bailing. It is also useful for temporary transfer from a clean sump.
The intake is not a vacuum cleaner. Sediment, roots and loose media still need to be kept away from the impeller.
Choose from both flow and lift
DS700 and DS1000 suit short, low-level circulation. DS2000 and DS3000 cover moderate transfer, while DS4000 and DS5000 provide 3.5 and 4 m maximum head for taller systems.
If the outlet is near the maximum-head figure, choose a stronger pump because the delivered flow will be very small.
External use needs flooded suction
When used outside the water, install the pump below water level with a permanently flooded inlet and no air leaks. Provide isolation valves and never allow it to run dry.
Our advice: DS is the family to choose when low-level draining matters. For continuous debris-rich pond filtration, use a screened filter pump instead.
Related Pump and Installation Categories
Charles Austen pump families · All pond pumps · Dry-mounted pumps · Pond pipework
Frequently Asked Questions
Can a DS pump drain a tank completely?
Its bottom intake can remove water to a low level, but some residual water normally remains.
Is DS self-priming?
No. External use requires a flooded inlet and correct installation.
Which model is best for a small reservoir?
DS700 or DS1000 may suit a low-flow duty; calculate required lift before choosing.
Which DS model has the most head?
DS5000 has the highest published maximum head at 4.0 m.
Can it pump nutrient solution?
The manufacturer markets DS for aquatic and hydroponic use, subject to compatibility and cleaning.
Can it pass gravel?
No. Protect the intake from stones, roots and loose growing media.
Can the rotor be cleaned?
Yes. Charles Austen highlights the easy-open cover and accessible rotor/impeller assembly.
Can DS run a pond filter?
It can move screened water, but a caged debris-handling filter pump is usually better for a typical pond floor.
Does maximum flow tell me what will reach the filter or waterfall?
No. Maximum flow is measured with little or no head. Lift, pipe length, fittings, hose diameter and connected equipment all reduce delivered flow.
Is maximum head the height at which I get full flow?
No. Maximum head is the shut-off end of the performance curve, where useful flow approaches zero.
Should I use the largest connection possible?
Usually yes. Generous, smooth pipework reduces friction and helps the pump deliver more water for the same electricity.
Can I reduce flow with a valve?
A valve can trim a water-pump output where the instructions allow, but a correctly sized pump or approved controller is normally more efficient than heavy throttling.
How often should I clean the pump?
Inspect it whenever flow falls and as part of routine pond maintenance. Keep the intake, rotor and impeller chamber clear without damaging seals or shafts.
Can you help size a DS pump?
Yes. Send us the required flow, vertical lift, pipe bore and length, major fittings and the equipment the pump will feed.
Why is my real flow lower than the model name?
Model names and maximum-flow figures do not include the resistance of a real installation. A flow test at the return is the best check after installation.
Can this series be installed externally?
The manufacturer describes the range as suitable for submersible or external use, but the exact flooded-suction, priming and weather-protection instructions must be followed.
