Pond One Pondmaster MK II Pond & Fountain Pump

The Pond One Pondmaster MK II is a versatile pond pump range designed for water circulation, fountains, waterfalls and pond filtration systems.

Available in seven sizes from 600L/hr through to 4,800L/hr, the Pondmaster MK II range gives you options for everything from small decorative water features through to larger garden ponds and filtration setups.

If you're unsure which model you need, don't just choose the pump with the biggest litres-per-hour number. Pond volume, required flow and the height you're pumping the water all matter.

Why Use a Pond Pump?

A pond pump keeps water moving.

That movement can be used to:

• Circulate water around the pond

• Move water through a pond filter

• Power a fountain

• Feed a waterfall or cascade

• Reduce stagnant areas

• Improve surface movement

• Help distribute filtered water throughout the pond

For fish ponds in particular, we'd generally rather see consistent water movement and filtration than a pond sitting completely stagnant.

A pump itself does not magically clean the pond — it needs to be used with suitable filtration if water quality and waste removal are the goal.

Which Pondmaster MK II Size Do I Need?

360PH

Maximum Flow: 600L/hr
Maximum Head: 0.85m

Best suited to:

• Small water features

• Small decorative ponds

• Small fountains

• Gentle circulation

This is the smallest model in the range and isn't the one we'd choose for pushing water a significant distance or height.

1300PH

Maximum Flow: 1,100L/hr
Maximum Head: 1.4m

Best suited to:

• Small garden ponds

• Water features

• Small fountains

• Light circulation

• Smaller filtration systems

A good step up from the 360PH when you need more usable flow.

1800PH

Maximum Flow: 1,800L/hr
Maximum Head: 2.15m

Best suited to:

• Small-to-medium ponds

• Pond filtration

• Fountains

• Small waterfalls

• General pond circulation

This is where the range starts becoming much more useful for a proper garden pond rather than simply a decorative feature.

2300PH

Maximum Flow: 2,200L/hr
Maximum Head: 2.2m

Best suited to:

• Medium garden ponds

• Filter systems

• Waterfalls

• Fountains

• General circulation

A useful middle-ground model if 1,800L/hr isn't quite enough but you don't need one of the larger pumps.

3300PH

Maximum Flow: 2,800L/hr
Maximum Head: 2.5m

Best suited to:

• Medium-to-larger ponds

• Pond filtration

• Larger fountains

• Waterfalls and cascades

• Systems with more plumbing resistance

A strong all-round option for many established garden ponds.

3600PH

Maximum Flow: 3,500L/hr
Maximum Head: 3.4m

Best suited to:

• Larger ponds

• Higher-flow filtration

• Waterfalls

• Larger water features

• Systems requiring greater lift

The additional head height makes this particularly useful when you're moving water substantially above the pond surface.

4900PH

Maximum Flow: 4,800L/hr
Maximum Head: approximately 3.6m

Best suited to:

• Larger garden ponds

• Higher-flow pond filtration

• Larger waterfalls

• High-volume circulation

• Systems requiring substantially more flow

This is the largest Pondmaster MK II model stocked by Simply Fish.

Pondmaster MK II Size Guide

What Does Maximum Head Height Mean?

This catches a lot of people out.

Maximum head height is not the height where the pump still produces its full advertised flow.

If a pump is rated at:

3,500L/hr with a 3.4m maximum head

that does not mean it delivers 3,500L/hr at 3.4m.

The flow rate reduces as the pump has to push water higher and overcome more resistance.

At the maximum head height, usable flow is approaching zero.

So if you're pumping water:

• Up a waterfall

• From the bottom of a deep pond

• Through a filter

• Through several metres of hose

• Around multiple bends

you need to allow for flow loss.

Don't Size a Pump Using Pond Volume Alone

A common rule of thumb is to circulate a pond's volume approximately once every 1–2 hours, but that is only a starting point.

A 2,000L decorative pond with no fish has very different requirements from a 2,000L heavily stocked Goldfish pond.

You also need to consider:

• Fish load

• Filter requirements

• Waterfall flow

• Head height

• Hose diameter

• Hose length

• Number of bends

• How much water movement you actually want

If your pond filter specifies a recommended flow range, use that requirement as part of your pump selection.

Example

Say you have a:

2,000L Goldfish pond

and want the pond volume circulating roughly once per hour.

You might initially think:

"Easy — I need a 2,000L/hr pump."

But if the pump has to push water:

• 1 metre uphill

• Through several metres of hose

• Through a filter

• Around a couple of bends

a pump rated at 2,000L/hr may deliver substantially less than that in the real installation.

In that situation, we'd generally give ourselves some headroom rather than selecting a pump that only just meets the theoretical requirement.

Pond Pump for a Waterfall

Waterfalls generally require more flow than people expect.

A tiny pump may technically get water to the top, but you could end up with:

a sad little trickle

instead of an actual waterfall.

When sizing for a waterfall, consider:

• Vertical height from pond surface to waterfall outlet

• Width of the waterfall

• Desired appearance

• Hose diameter

• Total plumbing length

The higher and wider the waterfall, the more pump capacity you generally need.

If you're unsure, we'd rather calculate it with you before you buy than sell you a pump that leaves you disappointed.

Pond Pump for Filtration

If you're using the Pondmaster to supply a pond filter, check the filter manufacturer's recommended flow rate.

Too little flow may mean the filtration system isn't receiving enough water.

Too much flow can also be a problem if water passes through the filter faster than the system is designed to handle.

The goal isn't simply:

biggest pump possible.

The pump and filter need to work together.

Explore our Pond Filters range if you're building or upgrading a complete filtration system.

Pond Pump vs Filter Pump

The Pondmaster MK II is an excellent general-purpose pond and fountain pump.

If you're primarily trying to move significant quantities of dirty pond water through a larger filtration system, you may also want to look at the Pond One MantaRay Filter Pump range.

The best option depends on whether your priority is:

• Fountain operation

• Waterfall operation

• General circulation

• Dedicated filtration

If you're unsure, contact Simply Fish with your pond dimensions and what you're trying to run.

How Do I Work Out My Pond Volume?

For a basic rectangular pond:

Length × Width × Average Depth = Pond Volume

If measuring in metres:

Length × Width × Depth × 1,000 = approximate litres

For example:

2m × 1.5m × 0.6m × 1,000 = approximately 1,800L

Irregular ponds are harder to calculate exactly, so use an average width and average depth rather than simply measuring the deepest point.

Knowing your approximate pond volume is useful for:

• Pump sizing

• Filter sizing

• Water treatment dosing

• Fish stocking

• Maintenance

Installation

Before installation:

1. Choose the correct pump size.

2. Check the pump and cable for damage.

3. Position the pump securely.

4. Connect appropriately sized hose or fountain fittings.

5. Avoid unnecessary restrictions or tight bends.

6. Make sure the pump intake isn't buried in sludge.

7. Start the pump.

8. Check the actual water flow.

9. Check all hose connections for leaks.

10. Adjust the fountain or waterfall as required.

Keep the Intake Clear

If your pond pump suddenly seems weak, don't immediately assume the motor is dying.

First check:

• Intake

• Sponge/prefilter

• Impeller

• Hose

• Fittings

• Filter

• Any leaves or string algae

Pond pumps can move a surprising amount of debris.

A partially blocked intake or dirty impeller can make a perfectly good pump look dramatically weaker.

Clean the Impeller

The impeller is one of the most important parts of a pond pump.

Over time it can accumulate:

• Slime

• Fine debris

• Algae

• Mineral buildup

• Plant material

Periodically:

1. Turn the pump off at the power.

2. Remove it safely.

3. Open the impeller housing.

4. Remove accumulated debris.

5. Check that the impeller spins correctly.

6. Reassemble the pump.

7. Restart and check flow.

Regular basic maintenance can make a big difference to both performance and lifespan.

Don't Run the Pump Dry

Never allow a pump designed for submerged operation to sit running without water.

If you're cleaning the pond or lowering the water level, make sure the pump remains correctly installed and supplied with water.

Switch it off when required.

Fountain or Circulation?

One advantage of the Pondmaster range is flexibility.

The pump can be used to create a decorative fountain while also contributing to water movement.

A fountain can:

• Add visual interest

• Create surface agitation

• Improve water movement

• Help reduce stagnant areas

However, don't mistake a fountain for complete pond filtration.

If you have fish producing waste, we'd still look at appropriate mechanical and biological filtration.

Does a Pond Pump Add Oxygen?

A pump itself mainly moves water.

However, when that water movement creates surface agitation, a fountain or waterfall, it can improve gas exchange between the pond water and atmosphere.

This can be particularly useful as pond temperatures rise.

For ponds where additional aeration is required, we also stock dedicated Pond One O2plus Air Machines.

Simply Fish Recommends

The biggest mistake we see when people choose pond pumps is focusing entirely on the number printed on the box.

They see:

2,200L/hr

and assume that's exactly how much water they'll get at the top of their waterfall.

It isn't.

The moment you start pushing water uphill and through hoses, fittings and filtration, flow begins to drop.

Our advice is:

Work out what you need the pump to do first, then choose the model.

For a little fountain, you don't need a monster.

For a filtration system or waterfall with significant head height, don't buy a pump that only just meets your theoretical flow requirement.

If you're unsure which Pondmaster to buy, send Simply Fish:

• Approximate pond length

• Width

• Average depth

• Whether you keep fish

• Height the water needs to be pumped

• Whether you're running a filter

• Whether you're running a fountain or waterfall

and we can help you narrow it down.

FAQ

Which Pondmaster MK II pump do I need?
It depends on pond volume, desired flow, head height and whether you're running filtration, a waterfall or a fountain. The range runs from 600L/hr to 4,800L/hr.

What does L/hr mean?
Litres per hour. It is the pump's maximum stated flow under low-resistance conditions.

What does maximum head mean?
It is approximately the maximum vertical height the pump can push water. Flow decreases as head height increases.

Will a 3,500L/hr pump still deliver 3,500L/hr at 3 metres high?
No. Actual flow decreases as the pump has to lift water higher and overcome plumbing resistance.

Can I use a Pondmaster for a waterfall?
Yes. Choose the model based on the waterfall height, width and desired flow.

Can I use it with a pond filter?
Yes, provided the selected model suits the filter's recommended flow requirements.

Can I use it for a fountain?
Yes. The Pondmaster range is designed for pond and fountain applications.

Can a pump be too powerful for a pond filter?
Yes. Check the filter's recommended maximum flow rather than automatically choosing the largest pump available.

Why has my pond pump lost flow?
Check for a blocked intake, dirty prefilter, clogged impeller, kinked hose, dirty filter or other plumbing restrictions before assuming the pump has failed.

How often should I clean my pond pump?
There isn't one fixed interval. Check it whenever flow noticeably reduces and inspect it periodically during periods of heavy pond use.

Does a pond pump oxygenate the water?
Water movement itself doesn't inject oxygen, but fountains, waterfalls and surface agitation can improve gas exchange.

Should I run my pond pump continuously?
For pumps supplying biological filtration, continuous operation is generally preferable because the filter relies on regular water flow. Other applications such as purely decorative fountains may be operated differently.

What if I'm unsure which pump I need?
Contact Simply Fish with your pond dimensions, approximate head height and what you're trying to operate. We'd rather help size it properly before you purchase.

Check out our spring pond care blog post for some helpful tips to get your pond ready for the warmer season!