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The Sunsun HW-304B is an external canister filter for freshwater tanks up to 150 gallons. It moves up to 525 GPH through five stages of mechanical, biological and chemical media, and it adds a built-in 9-watt UV sterilizer to cut algae spores and bacteria in the water. It ships with hoses, connectors, filter pads and media, so a large tank can run on one unit instead of two hang-on filters. Against rival canisters in its class, the UV stage is the differentiator; owners accept a bulky 17-inch body and occasional priming fuss in exchange.
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Availability unknownSold by easyforuse (99.6% positive, 47,100 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Out of stockSold by Gingerbread Tropical Fish
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Lowest price we've seen: $134.99 on Nov 15 at Walmart. Tracked across 4 stores since Nov 15.
Owners of large freshwater tanks rate the HW-304B for strong flow and clear water, and many credit the UV stage with holding down green water. Complaints center on priming, hose fit and the bulk of the unit.
The Sunsun HW-304B is an external canister filter for freshwater aquariums up to 150 gallons. It has five filtration stages and combines mechanical, biological and chemical filtration. A built-in 9-watt UV sterilizer helps promote clear water and control algae spores and bacteria.
The pump moves 525 GPH. The filter comes with media and filter pads. Ceramic rings, activated carbon and bio-balls are optional media. A hose and connectors in various sizes are included. Routine maintenance is replacing the UV light bulb every 6 to 12 months.
