AquaNano 22 Sponge Foam - 116s1 Sponge per packEasy to ReplaceChange the Sponge every 16 WeeksBiological Filter Sponge 15ppWe recommend only using Aqua One genuine spare parts in their AquaNano range of Filters. These 117s sponges for the aquariums should be replaced every 8 weeks to ensure peak tank conditions and crystal-clear water.Helpful Tip: Never wash an Aqua One Sponge pad out under the tap as this kills the beneficial bacteria. Instead squeeze the pad out in a little aquarium water which is then thrown away. After a few months the cell structure of the foam begins to collapse, and the pad will begin to get harder to rinse – at this point it should be exchanged for a new one.
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