Last Updated on April 24, 2023 by Coral Realm

Sunsun Hw 304B Pro Canister Filter Kit with 9-watt UV Sterilizer
  • HW-304B Pro Filtration Kit, Good for up to 150 gallon aquariums
  • Flow rate: 525 GPH (2000L/Hr)
  • Dimension: 11" L X 11" W X 17" H
  • Pro Kit Includes Canister Filter w/9 Watt UV, 4 White Filter Pads, 1 Blue Coarse Pad, 4 Media Baskets
  • Includes 1lb of Premium Filter Carbon, 1lb of Ceramic Rings and 1 Set of Bio Balls

Anyone who owns an aquarium knows that getting the right filter for your tank is vital for the health and happiness of your animals. The right canister filter will clean and maintain good quality water for your fish. 

The SunSun HW 304B canister filter will be able to do the job to the high standard that you expect. In this article we will summarize what the SunSun HW 304B canister filter can offer you and your aquarium.


SunSun HW 304B Pro Canister Filter Kit Review

SunSun HW 304B 525GPH Pro Canister Filter KitEase Of Use 

A canister filter is only a good filter if it’s easy to use, it would be useless if it was too complex for regular people to use! The SunSun HW 304B is designed with a very easy to use control and installation system. This makes it very easy for aquarium and filter newbies to install this model and get your filter up and running, and it also comes with an excellent instruction manual. 

The manual is very handy, as it also teaches you how to increase the capacity if you ever need it. The manual is quite simple to understand, and enables you to setup the entire canister with relative ease. There have been some reports of the manual being in broken English, so make sure to use common sense as well!


This canister filter is designed to be able to handle aquariums on the larger side, of up to 150 gallons. While this model may be too large for most nano saltwater fish, it could be perfect if you have more advanced saltwater fish that require a larger tank. It will also be perfect if you have any of these best freshwater fish. This model is very popular among many aquarium users, as it can filter this much water to a high grade, and will get your aquarium to a high water quality and then maintain it.

The large capacity enables it to be able to filter 525 gallons of water per hour, making the filtration time of this filter faster than many other models. If you need an aquarium to be cleaned and filtered quickly then this should be the model you look to to buy.

Noise Level

While this filter aims to give you quiet operation, there are quite a few comments and complaints about about a relatively high noise level compared to some other models.

The noise level does make a big difference in the enjoyment factor of your tank as a whole, so make sure that you have rubber pads or something similar to set it on, or can have it in a cupboard to reduce noise. 

Water Filtration

Filtration is the main thinking process in buying this model, and it should more than live up to your expectations. It has been designed with a three-stage filtration process which increases the chances of effectively cleaning the aquarium water. The three stages are biological, mechanical, and chemical filtrations.

You receive all the necessary filtration media in the kit. There are four media baskets and you will get four white filter pads, one blue coarse pad, 1lb each of premium filter carbon and ceramic rings and 1 set of bio balls. If you wish you can always buy your own aquarium filter media as well.

The porous ceramic rings will provide beneficial bacteria an ideal growing site which will aid in natural filtration and help prevent dangerous compounds from building up and will also help water clarity. The bio-balls promote gas exchange and increase dissolved oxygen levels. All of these filter medias can be used in any SunSun HW Canister filters or indeed any other filters.

The filtration system doesn’t end there though, this filter includes a 9W UV sterilizer. Utilizing the power of UV light, this model kills all the harmful bacteria and algae in your tank. This feature is quite rare amongst filters. When you think of how you would want the tank if you were a fish and living in it, this model gives the cleanliness required!


As with everything, this filter will need some maintenance at some point in its lifespan. Maintenance is vital to ensure it carries on working correctly and efficiently 

Getting the filter disassembled to clean it is just as quick and easy as putting it together. You can always check the manual if you think you’ll break it! There’s always online videos if you really need some guidance. Once opened up it can be cleaned and you can replenish the filtration materials then it’s ready to be reassembled.

Replenishing the filtration materials can seem daunting, but you simply need to know the sequence to arrange them in, to make sure that everything works correctly. It’s always easier to buy extra filtration materials whilst purchasing the filter so you avoid the hassle of having the filter taken apart and nothing to put into it! Always consult the manual when changing the filtration materials to ensure everything is placed correctly.


The SunSun HW 304B canister filter kit won’t ever let you down, and provides all the features and essentials, such as better filtration processes, your aquarium needs to be healthy and happy. Let’s have a quick look at the positives and negatives.

This aquarium canister filter can be used on any freshwater or saltwater aquarium, and the UV 9 Watt sterilizer kills any bacteria and algae that can harm your aquarium. It has a large capacity, able to process 535 gallons of water per hour, but is still very quiet when operational.

There have been reports of filter motor issues, and there’s some evidence that when the UV sterilizer is on for extended periods there may be some negative effects. However as you can see the positives do outweigh the negatives, and there are way more good reviews than bad!

Also see:

  • Hydor Professional External Canister Filter Review
  • Penn Plax Cascade Canister Aquarium Filter Review
  • Fluval FX6 Aquarium Canister Filter Review

About the author

Coral Realm

1 Comment

  • I need help with this. The water flow is bad after awhile we cleaned everything And made sure the tubes hooked up properly. After this last time there is a click noise every half hr or so. A click like something just went on. Any idea what that could be ? What the whole issue is I have followed direction on everything. I know this pump works great but only lasting 4mo

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