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Manual for Sunsun HW-304 Aquarium Filter. View and download the pdf, find answers to frequently asked questions and read feedback from users. SUNSUN HW-SERIES INSTRUCTION MANUAL HW-302. HW-303B. HW-304B. 110V/60Hz. 110V/60Hz. 110V/60Hz *HW-304B has 4 media trays. The UV sterilizer also promotes clear crystal water. The HW-304B canister filter also has a convenient self-priming pump that eliminates the need for manual $8.99. Replacement Hose Tubing Pipe Green Flexible Canister Filter SUNSUN HW-304 404. I just received my sunsun hw304b a few days ago and mine leaks, but I