Aquatop PF40-UV Hang-On Back Aquarium UV Sterilizer Power Filter, 40-gal

By Aquatop
Rated 3.5581 out of 5 stars
$107.99Chewy Price
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Fish TypeMarine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterMarine Fish, Tropical FreshwaterMarine Fish, Tropical Freshwater
Aquarium TypeSaltwater, FreshwaterSaltwater, FreshwaterSaltwater, FreshwaterFreshwaterFreshwater
MaterialPlasticPlasticPlasticPlastic, NylonPlastic, Nylon
Capacity (Max)Up to 75 Gallons75 to 150 allons

About This Item


  • Hang-on-back aquarium filter includes surface skimmer and built-in UV sterilizer.
  • Keeps the water clean, clear and helps eliminate unwanted algae blooms and free-floating parasites.
  • UV sterilizer needs no extra plumbing so it’s easy to set up with no additional hardware.
  • Available from 64 -128 gallons/hour filtering capacity with adjustable flow rate, and comes equipped for mechanical and chemical filtration.
  • Great for marine or freshwater aquariums up to 40 gallons, and fits on aquarium rims up to 3/4-inch thickness.

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Play Video: Learn More About Aquatop From Our Team of Experts
Learn More About Aquatop From Our Team of Experts

Compatible Products

When it's time to replace the filter cartridges, use the Aquatop Hang-On Back Aquarium Power Filter Replacement Carbon Cartridges Filter

Questions & Answers

18 Customer Questions

Will this UV light kill the good nitrogen-fixing bacterium?
Answer by ChewyMar 30, 2018
This product helps eliminate unwanted algae blooms, free-floating parasites, and disease pathogens.

Is this safe to use with an aquarium full of freshwater plants? Will I need to use some kind of shield or block to protect the plants from the light? Since it kills algae?
Answer by ChewyApr 21, 2018
This filter is intended for marine fish, tropical freshwater, and marine invertebrate. The plants won't need protection because the filter will only kill the bad elements in the tank.

how long do you suggest leaving the UV light on per day ?
Answer by ChewyJul 23, 2019
There is currently no designated amount of time that the UV light should stay on. However, it should not be used when first cycling the aquarium, as it may kill beneficial bacteria before they attach to the bio-media or gravel.

what filters do I buy to keep this running
Answer by ChewyJun 15, 2022
The "Aquatop Hang-On Back Aquarium Power Filter Replacement Carbon Cartridge" are compatible with this filter.

ReviewsWrite a Review

Rated 3.5581 out of 5 stars
43 Ratings
Would recommend to a friend

43 Customer Reviews

Rated 5 out of 5 stars
By Matt on Sep 18, 2021


bought this as a birthday present for my wife ... she tinkered with it all day while i was at work, and when i got back, the tank was completely clear ... this usually only happens just after the regular filters are changed, and that only lasts for a short while, but this time it's permanent ... what a treat to see the fish and not the funk ... couldn't be happier

Rated 1 out of 5 stars
By TotalZero on Oct 10, 2021

This is a total zero

Constantly stops working. Constantly leaks. Overpriced junk. Sadly I did not take it out of its box and put it together before the return window.

Rated 1 out of 5 stars
By Kayla27 on Jul 14, 2021

doesn’t work

Purchased this filter for my 25 gal tank and it did not work at all, the tank was filthy the next day. Took all proper precautions during assembly, and had a very hard time getting the filter to even suction any water. If there is anyone at chewy who could help me refund this item I would really appreciate it.

Rated 5 out of 5 stars
By Jlinny on Mar 5, 2021

Worth the investment

I cannot recommend this highly enough. I had struggled with our aquarium for months and no amount of vacuuming/water changes/etc. could touch the green water. Finally, I gave in and spent the money on this in hopes that the UV light would help. In the matter of a few days, it went from not being able to see more than 3 - 4" into the water to crystal clear. Setup was extremely easy. Best advice I can give is if you are trying to fix really green water, slow the intake (very easy with the black dial) and rinse the filter once or twice a day until the water clears. It will get gummed up and slow the amount of water that goes by the uv light and more that will just spill back into the aquarium.

Rated 5 out of 5 stars
By Mark on Jul 23, 2021

UV light hob filter

Terrific product really satisfied with my purchase Awesome filter Fast delivery!

Rated 5 out of 5 stars
By Kristen on Jan 15, 2021

Wonder filter

Ordered this because battled algae blooms for over a year. Numerous chemicals used, polishing pads and filter media, even removed fish twice and broke down tank for cleaning. I have kept fresh and saltwater fish for 40 years with tanks over 500 gallons and never had this happen. Started Aquatop uv filter on 55 gallon tank (made for 40 gallons) and after 4 days tank is crystal. GREATEST filter ever. Had to tighten the motor to stop leaking but other than that, no problems. Going to put them on all my tanks. Soooo Happy.

Rated 1 out of 5 stars
By Somebody on Feb 28, 2021

Keep Shopping

I’ve had this 6 days. Set it up and never touched it again. Noticed this morning it’s stopped pumping water. The cheap plastic seems to be leaking air, preventing it from sucking water in.

Rated 2 out of 5 stars
By SamsDad on Sep 25, 2020

Great features - Poor quality - Only lasted 2 months before it failed

This filter has some great features: UV Sterilization Flow Control Independent UV Light Control (Separate Cord) - think timer if in bedroom so it's not bright at night Skimmer - Though in practice it sank below water level in short order and never skimmed again. It also rubs on the cut-out. This filter however suffers from very poor quality construction and a couple design flaws: 1) The notch for the skimmer float actually allows water that overflows to run through the notch over the back of the aquarium. I didn't experience this but many others have and it flooded there house because of it 2) The impeller is only support at the bottom. As such the impeller seizes easily. I had a small power bump that stopped the impeller from spinning. While stopped the outer impeller housing that holds the AC Coil Windings got so hot the plastic melted enough to skew the impeller shaft 5-10 degrees from vertical. This was getting close to a fire risk. If I had not caught it i.e. I had been gone for a couple days this could have started a house fire. Yes it is that serious of a flaw and yes I do understand what I am saying -- Electrical Engineer and registered professional engineer in the state of Washington. So I'm not uninformed when it comes to electricity, motors, pumps etc.. 3) The skimmer function requires an air pocket to float the skimmer at water level. Because the air pocket collapsed regularly I couldn't get the skimmer to stay floating on the surface so this function rarely works in practice. Overall, I would recommend other Hang On Tank filters over this one as the design flaws and construction quality are lacking. I really did want this filter to work out but is just doesn't. This isn't the first Aquatop product I've had fail early either. I recognize this is a "value" end of the spectrum product but 2 months and the design flaws noted should make anyone warry. Aquatop needs to put a lot more into improving their products quality/longevity even at Ford Pinto pricing if they want avoid exploding like the Pinto did. I didn't give it a one start because there is always a chance my experience was unique - I doubt it though if you look around the web for other reviews on Aquatop products.

Rated 1 out of 5 stars
By sgrammer on Oct 29, 2020

Waste of money!!!

Worst HOB filter i have used...bought a Penguin Biowheel to try replace with.

Rated 3 out of 5 stars
By JenR on May 31, 2020

Baby Fish Warning

Please be aware that not only will you need a sponge on filter intake tube; you will also need one on the return as a baffle and this product also has a surface skimmer which can suck your babies into the impeller. Heart Broken. You must pull the skimmer up to the top of the intake tube until it snugs to deactivate it. This filter is very powerful and the overflow overflows even when you turn it down to almost closed. It's supposed to be an aquarium not a washing machine.