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I love Purigen. The 100ml version comes already prebagged, and fits in most filters. Lasts 6 months (give or take) and you can recharge it with a soak in some bleach.

Also, no need to replace the foam that often, just rinse it out in your dirty tank water when you do a water change. Washing will clean it out so you can continue using it for mechanical filtration, and its already colonized by beneficial bacteria. If you put a new piece in you're going to go through a mini cycle.
 
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