Exactly what the manufacturer said. recommends replacement. Pretty pricey when you need one every month, but I haven't noticed other manufacturers selling similar sized charcoal pellets. The "Filter" itself is a 4-level system; The packet of charcoal pellets is only stage 3. I clean everything often and to save money I rinse the bag of charcoal with water and REUSE it a second time. I hope the turtle doesn't mind.
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