Aquaneat 16pcs Cnister Filter Pads Bio Sponge Floss for SUNSUN/GRECH/HW-303B Aquarium Replacement Filter Media (4 Bio + 12 Floss)

Features: Fit for SUNSUN/PERFECT/GRECH/SUPER HW-303B, Polar Aurora 370gph, Aquatop CF400 Canister filters. 4 pcs of blue coarse filter pads: Serving as host for the beneficial bacteria colonies which are essential to a healthy aquarium. (Reusable after rinsed) 12 pcs of white fine filter pads: Trapping particles of uneaten food, fish waste, decayed plant materials, and other debris without restricting water flow. Size: 7.5" (L) x 7.5" (W) x 0.75" (H) DIMENSION: 7.5" (L) x 7.5" (W) x 0.75" (H) INCLUDES: 4 piece of blue filter pads 12 pieces of white filter pads Tips for Usage and Maintenance: It is recommended to place the blue filter sponge after the white filter pad Maintenance of Blue Filter Pad: The sponge will need to be rinsed every time it becomes dirty, about once every 1 to 4 weeks. It's helpful to reserve the beneficial bacteria by washing the sponge gently with water from the fish tank instead of tap water. After 6 to 12 months' usage, the micro holes of sponge is gradually clogged by the tiny debris, the beneficial bacteria won't have as much living space as before. That's when the sponge filter starts to lose its efficiency. So it is also recommended to replace the sponge once 6 to 12 month or when the sponge gets worn out.