SunSun Hw303B 370GPH Pro Canister Filter Kit with 9-watt UV Sterilizer
Brand: SunSun
Best for
Best budget
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 2 trusted sources
Current price
$156.99
Updated May 14, 2026 · 1 min read

Sources behind this verdict
10 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, the SunSun HW-303B is the budget canister that specialist communities most consistently endorse. A high-trust r/Aquariums comment from a discussion of off-brand canisters states plainly that 'the only decent off-brand canister filters are sunsun canisters — they work about as well as a fluval,' and r/PlantedTank users describe it as silent with plenty of media space. The fishlore.com forum review scored it 8.5/10, calling the value-for-money impressive.
What reviewers liked
- High-trust r/Aquariums consensus singles out SunSun as the only off-brand canister comparable to Fluval
- r/PlantedTank users report silent operation and ample media capacity
- fishlore.com forum review scored it 8.5/10 for value
- Includes integrated 9W UV sterilizer at a price point well below name-brand canisters
Where it falls short
- r/Aquariums user documented unusually high power draw (46W for the 403b model)
- fishlore.com reviewer wished the UV sterilizer was stronger
- Off-brand parts and long-term support are less established than Fluval or Oase
- One r/Aquariums user raised concern about UV bulb heat and plastic compatibility
Across the reviewers we read, the SunSun HW-303B is the budget canister that specialist communities most consistently endorse. A high-trust r/Aquariums comment from a discussion of off-brand canisters states plainly that 'the only decent off-brand canister filters are sunsun canisters — they work about as well as a fluval,' and r/PlantedTank users describe it as silent with plenty of media space. The fishlore.com forum review scored it 8.5/10, calling the value-for-money impressive.
The honest cons surfaced in high-trust threads matter. One r/Aquariums commenter pulled the spec sheet and noted the 403b draws 46W to deliver 1400 lph — significantly more power than name-brand equivalents — and the fishlore reviewer wished the integrated UV sterilizer was stronger. A r/Aquariums user also flagged concern about UV bulb melting plastic in some configurations. The Facebook group discussion captured the core buyer dilemma honestly: 'just save my money and get a fluval?'
The net consensus is that SunSun delivers Fluval-adjacent filtration performance at a fraction of the price, with the tradeoffs being higher power draw, weaker integrated UV, and the typical off-brand uncertainty around long-term parts support. For buyers who want canister-class filtration on a budget, reviewers across communities consistently flag it as the off-brand to buy.
- Highlight 1
- HW-303B Pro Filtration Kit, Good for up to 100 gallon aquariums
- Flow rate
- 370 GPH (1400L/Hr)
- Dimension
- 10.5" L X 10.5" W X 16" H
- Highlight 4
- Pro Kit Includes Canister Filter w/9 Watt UV, 3 White Filter Pads, 1 Blue Coarse Pad, 3 Media Baskets
- Highlight 5
- Includes 1lb of Premium Filter Carbon, 1lb of Ceramic Rings and 1 Set of Bio Balls
Take a closer look at their descriptions: They use tons of power compared to brand filters: 46 W for the 403b with 1400 lph flowrate of the pump ...
This one doesn't have a uv sterilizer, but has a lower gph, which I like because of my betta. The uv also makes me worry because of melting ...
Trust tier reflects our editorial assessment of the source, not the individual quote. Hover for the rationale. See how we tier sources →
“SunSun HW 303B External Canister Filter Review” · YouTube
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