How to silence a noisy air pump

If you have an aquarium air pump that makes a terrible rattling sound, you can modify it with a few squirts of hot-melt glue, silicone or any other space-filling adhesive or sealant to be as near to silent as it's ever likely to get. I have two Rena Air 600 air pumps (it's called a Rena Air 400 in the US), and they were both really noisy until I opened them up and modified them to stop the components inside from rattling around. Wrapping air pumps in towels will muffle the sound, but quickly lea

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• #aquarium
• #air_pump