The Ultum Nature Systems Sigma Aquarium Water Pump is a compact, fully submersible water circulation pump engineered for energy-efficient water movement in aquariums, paludariums, and all-in-one (AIO) tank setups. Let us be honest, nothing triggers stubborn algae outbreaks or starves aquatic plants faster than dead spots with sluggish circulation. Designed with a sleek, low-profile footprint, the UNS Sigma operates quietly beneath the water line without disrupting your aquascape's visual focus.
Always verify your specific UNS tank model compatibility and hose barb diameter requirements prior to selecting a pump size.
| Model Variant | Dimensions (L x W x H) | Max Flow Rate | Max Lift (Head) | Power Specs | Outflow Barb Sizes | UNS System Compatibility |
|---|---|---|---|---|---|---|
| Sigma 5 | 1.96 x 1.96 x 1.85 in | 79 GPH | 2.6 ft | DC 5V / 5W | 3/8 in, 1/2 in | UNS Foresta 35E, 30A White |
| Sigma 10 | 1.77 x 2.63 x 2.87 in | 158.5 GPH | 3.6 ft | DC 12V / 10W | 3/8 in, 1/2 in | UNS Dual AIO 30A, Dual AIO 45A, Foresta 60E |
| Sigma 15 | 2.00 x 2.95 x 3.74 in | 237.8 GPH | 5.2 ft | DC 12V / 15W | 1/2 in | UNS Dual AIO 35A, Dual AIO 40A, Dual AIO 90LA |
| Sigma 20 | 2.44 x 3.93 x 4.13 in | 396 GPH | 8.2 ft | DC 12V / 20W | 1/2 in, 5/8 in | UNS Dual AIO 60A, Foresta PHS 174 |
1. How does proper water flow from a pump help control algae?
Good circulation eliminates stagnant pockets where organic detritus and excess nutrients accumulate. Pushing water evenly ensures CO2 and nutrients reach all aquatic plants efficiently, fueling healthy plant growth that outcompetes algae.
2. How do I clean and maintain my UNS Sigma Water Pump?
Unplug the pump, disconnect the outflow hose, and pull off the front intake faceplate to access the magnetic impeller assembly. Rinse the rotor shaft and motor well with clean water every 2 to 3 months to remove trapped biofilm and mineral scale.
Overall rating: 4.857143 / 5 from 7 reviews.
Review topics: [].
"Products arrived fast and plants were in great shape"
"I needed to downgrade my pump because the sigma 10 was too strong for my betta in my 9Gal tank, so far we've had no issues and betta is much happier and can swim calmly now. I do wish it had the split wire to disconnect the cord but the USB is nice, too."
"Exactly as ordered"
"Exactly what I needed and on time"
"Perfect for adding some flow in small tanks! My fish like swimming in front of it."
"Pump works perfectly."
"Thanks for replacing"
