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We've a disposable filter system. Is this to be replaced each week for turtles? It is for fish and the manufacturer suggests 3 to 4 weeks. the water turned green after the first week. I threw it out. Was that premature? How long should it last for turtles?

Turtles are very dirty creatures, you need to buy a filter that is rated for a tank 3 or 4 times bigger than what you have.

nfm.