Pentair Aquatics

Smart UV Sterilizer 40 Watt

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Emperor Aquatics is now Pentair Aquatic Eco-Systems.


Why does BRS recommend this?

When it comes to UV most other companies will recommend a small UV for a large tank which in reality won’t do much more than make your water look a bit clearer.  If your ultimate goal is to keep bacteria, protozoa, and other free-floating pathogens at bay you really can't do much better than Pentair Aquatics for UV sterilizers.  With their real-world ratings, we have tried other UV sterilizers and really nothing else has come close.  Even though they are a bit more expensive than other brands, their performance makes them worth every penny.


Bulk Reef Supply carries the Pentair Aquatics line of UV Equipment because we feel they product some of the best UV sterilizers available to the aquarium industry and are one of the few brands that offer legitimately sized units capable of fulfilling their claims. Pentair Aquatics SMART UV series features a compact space saving design which utilizes a 3" reaction chamber. When used properly UV Sterilizers significantly reduce the chance of encountering disease or algae outbreaks.


Pentair Aquatics UV Sterilizers are superior in the following ways:

  • Sterilizers are accurately sized based on contact time, flow rate and tank volume to achieve realistic results.
  • Suggested sizes are based on end of bulb life to ensure continuous results
  • Suggested flow rates factor in the water clarity and UV Transmittance of typical aquariums rather than basing them on purified water.
  • Unique design maximizes the effective contact time by utilizing the full bulb length.
  • Pentair Aquatics is trusted by zoos, universities and public aquariums including Duke University, Monterey Bay Aquarium, SeaWorld, Georgia Aquarium, USDA Agricultural Research


UV sterilizers are most effective as a preventative measure against disease outbreak. While not infallible, a properly sized and set up sterilizer will add a significant barrier to disease outbreak. Protecting your system and it's inhabitants will ultimately save money, promote long-lived healthy fish and increase satisfaction received from the hobby. Sterilizers can also be used as a component of an effective strategy to current outbreak. Primarily to help ensure the outbreak doesn't re-emerge after treatment. Anyone who has had the misfortune to encounter an outbreak will appreciate the importance of preventive measures against future problems.


Suggested Aquarium Size: 260 gallon or less

  • Minimum Operational Flow Rate: 157 GPH
  • Maximum Operational Flow Rate: 1574 GPH



  • Max Aquarium Size: 260 Gallons
  • Number of Lamps: 1
  • Algae & Bacteria Water Flow Rate: 943GPH/1574GPH (Suggested*/Maximum)
  • Protozoa Bacteria Water Flow Rate: 157GPH/262GPH (Suggested*/Maximum)
  • Input Watts: 40 watts
  • UV-C Output Watts: 14 watts
  • UV Body Length: 43.75"
  • UV Body Diameter: 3.5"
  • Inlet/Outlet Size: 1.5" PVC Unions


Model  Maximum Aquarium Size No. Lamps/Watts Water Flow Rate Algae and Bacteria 30,000 µWs/cm² Suggested/Maximum Water Flow Rate
180,000 µWs/cm² Suggested/Maximum
Input Watts Dimensions (Inches) Inlet/Outlet
Smart UV 40 260 Gallons 1/40 943 GPH/1574 GPH 157 GPH/262 GPH 40 43.75" x 3.5" 1.5" Union


*Suggested flow rates are based on 80% power or "end of lamp's life" performance

*Maximum flow rates are based on 100% power or new lamp output

*Flow rates consider 90% UV transmissibility

More Information
Manuals Owners Manual
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Product Questions

need replacement light bulb
Question by: jeffrey oliu on Dec 31, 2022, 11:16 AM
Here would be the listing for the replacement bulb: https://www.bulkreefsupply.com/emperor-aquatics-replacement-uv-lamp.html

SKU: 204911
Answer by: William Reed (BRS Staff) on Jan 12, 2023, 10:12 AM
Hi, I am considering getting one of the 40w UVs for my Cade 1800 (~220g total water volume) for dinos. I have a Sicce 1.0 (251gph) pump that I was thinking of using - would this be feasible? If so, what plumbing/fittings would I need to get to plumb using flexible tubing?

Question by: Gregg on May 16, 2022, 10:36 AM
Thank you for your question. I believe a DC controllable pump with a gate valve would be more efficient for use with a UV sterilizer to adjust flow according to changing needs of the aquarium over time. The standard AC pumps with a singular flow rate can be dialed back but also use more electricity when using a gate valve to slow them down. The Sicce 1.0 is on the lower end of the acceptable flow range for this UV unit and with head loss and chamber size on the UV unit, it may not be able to perform as expected. You may want to check out a VarioS-2 pump or a little larger depending on what you would like to control in the aquarium. The VarioS-2 comes with a 1" slip pvc union, while the UV comes with a 1.5" pvc union. For the tubing SKU:210943, clamps sku:203072, reducer on the UV sku: 209997 (qty 2), barbs sku: 209983 (qty2), for that Varios pump(or any pump with 1" pvc connection to barb fitting sku:207927. You will need to determine how much tubing you will require to operate it depending on the installation location, but that should get you started.
Answer by: Rick Pucciarella (BRS Staff) on May 18, 2022, 8:26 AM
Are the 1 1/2” intake and outputs threaded or slip fit? I’m planning on hard piping it to 1” pvc and need bushings to pipe it.
Question by: Tom Young on May 8, 2022, 12:52 PM
Hey there,
Thank you for reaching out to us. Those are slip fittings.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on May 10, 2022, 11:52 AM
Hello, does your 1.5" union ( SKU 202522) fit the threaded flange on the pentair aquatics smart uv 40 watt (SKU 204905)? I plumbed a 1/2" reducer into the inlet/outlet, attached a sicce 1.5 and noticed the max flow is 80 GPH per my neptune 1/2" flow sensor. I need to re-plumb to 3/4" to see if I can increase to the recommended flow. Sorry if this is a duplicate question. I submitted a question last night, but don't remember adding my email address, so that is why I'm posting the question again. Thank you.

Question by: Rick on Apr 17, 2020, 11:39 AM
Hi Rick,

Unfortunately our unions will not fit the Pentair UV units. You will need to reach out to them to see if you can obtain a replacement directly.
They can be reached at 1-877-347-4788 or DLUSAPOReturns@Pentair.com

I hope this helps!
Happy Reefing
Answer by: Nick on Apr 20, 2020, 5:05 PM
Can the output be sized down to a 1/2” so I could use the apex 1/2” flow sensor?
Question by: Alan Crawford on Mar 9, 2020, 4:36 PM
Hey there,

It can be reduced but not recommended. That would drastically effect the flow rate by reducing more than 50%, putting a ton of back pressure on your pump.

Take care
Answer by: Thomas Billington on Mar 10, 2020, 11:26 AM
Does BRS sell the bracket (clamp) to secure the UV sterilizer ?
Question by: RobertCA on Sep 13, 2017, 12:25 PM
We do carry surface mounting clamps that can be used with the Pentair UV sterilizers. The 40w version does have a 3” body and the 3” mounting clamps will work with that sterilizer.
Answer by: Charlie on Sep 13, 2017, 12:40 PM
replacement bulbs ?
Question by: artur mazurek on Jul 19, 2017, 6:06 PM
Hey there,
Thanks for getting in touch with us in regards to replacement 40W bulbs for your UV sterilizer. Below I have included a link to the product that you are looking for. Please let me know if there is anything else that we can assist with. Thanks!

Answer by: Tyler Schafer on Jul 20, 2017, 10:36 AM
I have the unit mounted horizontally with the input and outlet positioned downward. But the chamber only fills 1/4 of the way with water. Is this correct, or should it be filled all the way. Or do I have it positioned incorrectly? Not enough room to position vertically
Question by: Don McLaurin on May 15, 2017, 5:39 AM
Hey there,
You will always want to position or plumb the outlet so that the water will fill the reaction chamber completely. The outlet should be at the highest point possible. If you are unable to point the outlet up, you should plumb the outlet so that is goes above the UV reactor in order to prevent the chamber from emptying.

Answer by: Zack on May 17, 2017, 3:43 PM
do this unit comes with any type of holders at all and can i change my inlet/outlet to 1/2 inch, thanks
Question by: Carlos G Rodriguez on Jan 25, 2017, 11:07 AM
Awesome questions! Although there are no hanging or mounting options for the sterilizer itself, you can use these PVC clips to hold it by the plumbing. https://www.bulkreefsupply.com/sm-clamp-for-pvc-pipe.html

You can definitely reduce those fittings to meet your needs! :-)
Answer by: Randy on Jan 28, 2017, 10:52 AM
I've read that UV sterilizers can kill copepods and other beneficial critters, is that true? And if so can I run a UV sterilizer at a higher flow to keep algea at bay but not kill the good guys?
Question by: Eric Boyko on Jan 18, 2017, 8:34 AM
Great question! Most beneficial creatures like amphipods, copepods, and beneficial bacteria do not live in the water column itself. They live in the pores and crevices of the rock and sand and the vast majority of them will not flow through the system and end up in the UV sterilizer. It is possible for a few to make it through, but it will not completely wipe out the entire populations. :-)
Answer by: Randy on Jan 19, 2017, 2:28 PM
Does this setup come with every thing I need for a complete installation or do I need to purchase other items as well such as an additional pump and plumbing?
Question by: Ryan on Nov 23, 2016, 8:13 PM
Great quesiton! You will need to purchase a feed pump with a flow rating around 160 GPH/300 GPH, as well as the plumbing needed to connect to this product's inlet and outlet. The inlet and outlet plumbing sizes are 1½" Union. :-)
Answer by: Randy on Nov 25, 2016, 8:51 AM
Which sicce model do you reccomend for the smart uv 40 watt? Thanks!
Question by: Ryan on Jun 28, 2016, 9:37 PM
Great question!
The sicce 1.0 will work well with no head height. From there if there is back pressure or head height restricting the pump we recommend the sicce 1.5
Answer by: Connor on Jul 1, 2016, 9:51 AM
I thought you need to plumb the UV so that ALL water returning to tank from sump should flow through the Unit. But all of the set ups I have seen on You Tube show the UV being fed from separate pump in sump with water flowing through the UV and back to the sump? Doesn't sump-to-sump set up significantly decrease the effectiveness of the UV?


Question by: Mike on Jun 4, 2016, 1:35 PM
Great question!
With these UV sterilizers in particular they will run on slower flow rates and increased water contact time. In most cases you will not need to return the water up to the tank but simply by drawing the water from an earlier section in the sump to a later section of the sump will improve performance. While ideally a full UV sterilizer could work the current set up with a feed pump works great on al of our units! Feel free to let us know if you have any further questions!
Answer by: Connor on Jun 9, 2016, 1:45 PM
Hey there,

I'm curious to know if 40 watts is too much for 150 gallon reef tank? Can you have too much wattage to gallons? I just want to make sure anything that passes through it gets nuked. Let me know what you think.
Question by: Michael Hardman on Apr 30, 2016, 8:45 PM
Great question! With UV sterilizers it is almost impossible to "oversize", 40 watts should be great on a 150 gallon system :)
Answer by: Carter Mueller on May 3, 2016, 4:19 PM
Can I get it with 210V AC ADAPTER?
Question by: Moh Aifan on Apr 13, 2016, 3:07 AM
Great question!
All of our products are intended for use in North America and will not come with 210V adapters. For international orders you will want to contact the manufacturer directly. Feel free to let us know if you have any further questions!
Answer by: Connor on Apr 13, 2016, 3:05 PM
What is the difference between this 40 watt uv and the other 40 watt smart uv. Why is this rated higher per gallon then the other?
Question by: Lance Barnes on Mar 29, 2016, 10:01 AM
Great question!
The difference will come down to flow through the chamber as well as overall size.Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 30, 2016, 11:38 AM
Can this be installed using an existing manifold?
Question by: Alex N on Mar 28, 2016, 9:20 AM
Great question!
This certainly can be used with existing manifolds very easily. The unit will come with appropriate barb fittings to connect to 3/4" soft tubing. additionally you can use hard plumbing to connect the sterilizer. Feel free to let us know if you have any further questions!
Answer by: Connor on Mar 29, 2016, 11:33 AM
What size pump would you use ? 180 gallon sps ....
Question by: walter on Jan 25, 2016, 2:42 AM
Great question!
We have had great luck with the Sicce Syncra Silent 1.5. This pump is a little over-sized however by the time it is plumbed in the flow will be reduced. Feel free to let us know if you have any further questions!
Answer by: Connor on Feb 3, 2016, 12:02 PM