Replacement Filter Pads for SUNSUN/GRECH/AQUATOP HW-303B CF400 Aquarium Filters

The SUNSUN HW-303B / HW-505A AQUATOP UV CF400 Canister filterGrech GW-303BPerfect HW-303BPolar Aurora 370gph UV provides both mechanical and biological filtration. It includes 12 fine white pads and 4 blue coarse pads, with dimensions of 7.5” (L) x 7.5” (W) x 0.75” (H). The white fine pads filter out fine particles, allowing for clear water, while the blue coarse pads trap visible particles without restricting water flow and serve as a host for beneficial bacteria. The blue pads can be reused after rinsing.

Maintenance tips for the sponges include rinsing them every time they become dirty, about once every 1 to 4 weeks, and washing them gently with water from the fish tank instead of tap water to reserve beneficial bacteria. After 6 to 12 months of usage, the micro holes of the sponge may become clogged by tiny debris, reducing the living space for beneficial bacteria and causing the sponge filter to lose efficiency. It is recommended to replace the sponge once every 6 to 12 months or when it becomes worn out.

This filter is suitable for both freshwater and saltwater aquariums, and it removes the smallest dirt particles while maintaining perfect water flow. It is a perfect fit for SUNSUN/AQUATOP/Polar Aurora 370gph HW-303B CF400 UV Filters.

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