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I haven't seen much on here about the Marineland Penguin 350 with bio wheels. I have one for my 37 gallon tank and I was just curious as too how often I have to replace the cartridges? I've seen some videos on you tube where some people have just rinsed them and put them back in. Which leads me to my next question. If your just rinsing them and reusing them than how often do you have to replace the carbon? I'd love to just be able to rinse them and reuse them until they start falling apart but I'd have to cut them open to replace the carbon. Any DIY helpful hints for that? They do have double slots in case you want to add an extra cartridge. I saw someone on you tube use that extra space by adding an extra carbon pouch. Was thinking about doing the same. Not sure if he made those pouches himself or if you can buy them. I'd rather make my own. If I decide to add a carbon pouch and make my own what would be a good material to use to make them with? I'm very knew to keeping aquariums and I've spent a lot of money lately on mistakes, so I'm trying to pinch my pennies now by trying the DIY method. Thanks all in advance.