As Mr Telboy has allready said!
The air driven ones are so simple and easy to use! They take a bout 4 weeks from new to get fully efective,To keep them clean just sqweeze them in tank water! what i do is syphon the phoo/muck off the tank bottom into a bucket ,let this settle for 5 10 minutes and then sqweeze your filter.( never run them under the tap!)
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