Name: SOBO Submersible Water Pump – WP-3200 to WP-3500
Brand: SOBO
SKU: SOBO-WP
Availability: InStock
Rating: 4.44 (16 reviews)

Question 1

How do I choose the right SOBO pump model for my aquarium?

Accepted Answer

The standard rule for filter pump sizing: your pump flow rate should cycle the full tank volume 4–6 times per hour for adequate biological filtration. Examples: a 60L tank needs a pump delivering 240–360 L/h minimum — the WP-3200 (280 L/h) is borderline; the WP-3300 (600 L/h) gives comfortable headroom. A 100L tank needs 400–600 L/h — the WP-3300 or WP-3400 are appropriate. A 200L tank needs 800–1200 L/h — the WP-3400 or WP-3500. For powerhead-only circulation (no filter media), a lower flow rate of 2–4 tank volumes per hour is sufficient, which means you can use a smaller model for circulation-only applications.

Question 2

Can SOBO pumps be used in saltwater and marine aquariums?

Accepted Answer

Yes — SOBO WP series pumps are suitable for both freshwater and marine aquariums. The impeller assembly uses a ceramic shaft which does not corrode in saltwater. Monthly cleaning is important in marine use as salt creep and calcium deposits accumulate faster than in freshwater. After removing the pump from a marine tank for cleaning, rinse all components with clean freshwater before reassembling — this removes salt deposits that otherwise crystallise and damage the impeller housing seals. The WP-3300 and WP-3400 are commonly used as sump return pumps in small to medium reef aquariums; the WP-3500 suits medium reef sump systems.

Question 3

My SOBO pump is making a loud grinding or rattling noise — what is wrong?

Accepted Answer

A grinding or rattling noise from a SOBO pump is almost always caused by one of three things: debris in the impeller housing (most common), a worn or chipped ceramic shaft, or a cracked/damaged impeller blade. Solution: switch off and unplug the pump immediately, remove from the tank and disassemble the impeller housing. Inspect the impeller cavity for debris (sand, gravel, snail shells, plant matter) — remove any debris with a small brush and rinse thoroughly. Inspect the ceramic shaft for cracks or chips — replace if damaged. Inspect the impeller blades for chips — replace if damaged. Reassemble and test. A pump running noisily will continue to degrade rapidly if left running.

Question 4

How often should I clean the SOBO pump impeller?

Accepted Answer

Monthly cleaning is the standard recommendation for SOBO WP series pumps in most aquarium setups. In planted aquariums: monthly cleaning prevents plant matter and algae from accumulating in the impeller housing. In marine aquariums: monthly cleaning prevents calcium and salt deposit buildup. In tanks with fine substrate (sand): consider cleaning every 3 weeks as fine particles are more likely to enter the impeller. The cleaning process takes approximately 5 minutes once you are familiar with the assembly — remove the pump, twist off the impeller cover, remove and rinse the impeller and ceramic shaft, reassemble. A clean pump runs quieter, lasts longer and delivers its rated flow rate.

Question 5

What happens if I run the SOBO pump out of water?

Accepted Answer

Running a SOBO pump out of water — even briefly — causes immediate damage to the impeller bearings and ceramic shaft. The impeller relies on water as both a lubricant and coolant. Without water, the ceramic shaft overheats and can crack, the impeller bearings seize, and the motor windings overheat. In some cases the impeller will melt or deform within 30–60 seconds. Always ensure the pump is fully submerged before switching on. If the pump was accidentally run dry: switch off immediately, do not restart until the pump has cooled completely, then disassemble and inspect the impeller and ceramic shaft before restarting. If the shaft is cracked or the impeller is damaged, replace the impeller assembly before running the pump again.

Question 6

Can I use the SOBO WP-3500 for a pond?

Accepted Answer

The SOBO WP-3500 at 25W and 1200 L/h can serve as a feed pump for a small pond filter or small indoor pond — typically suitable for ponds up to 1000L in volume at the minimum 1× per hour turnover that ponds require. For a 500L garden pond, the WP-3500 provides approximately 2.4× turnover per hour which is adequate for a lightly stocked pond. For heavily stocked ponds or ponds over 1000L, a dedicated pond pump with higher flow rates and weather-resistant construction is more appropriate. The SOBO WP series is designed for aquarium use — the suction cups and housing are not designed for prolonged outdoor pond conditions with temperature extremes, UV exposure and debris loads typical of outdoor water features.

Question 7

Is the SOBO pump flow rate adjustable?

Accepted Answer

The WP-3400 and WP-3500 include a built-in flow control dial on the pump body that allows reducing flow rate from the maximum rated output. This is useful when the full rated flow creates too much current for sensitive fish (small nano fish, wild bettas, fry) or when the pump is being used in an application where lower flow is appropriate (UV steriliser feed, slow sump return). The WP-3200 and WP-3300 do not include a flow control dial — their output is the rated maximum flow. For flow adjustment on the WP-3200 and WP-3300, use a ball valve or flow restrictor on the outlet tubing, or position the pump at an angle to reduce effective output.

Question 8

How long will a SOBO pump last?

Accepted Answer

With correct installation (always submerged), monthly cleaning and annual ceramic shaft inspection, a SOBO WP series pump typically lasts 2–4 years in continuous operation. Key factors that shorten pump lifespan: running dry even briefly (most common cause of early failure), infrequent cleaning that allows mineral deposits to accumulate on the impeller, running in high-temperature water above 35°C, and physical damage to the power cable. The ceramic shaft is the most wear-prone component — it can be replaced independently without replacing the entire pump, making SOBO pumps economical to maintain. Replacement impeller assemblies (impeller + ceramic shaft) are available and significantly extend pump lifespan beyond what would otherwise be a complete replacement.

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