Despite owning a milwaukee digital phosphate meter which imo gives you a much more accurate reading then a test kit, I change my media every 2 weeks semi religiously. I used to be bang on, but have let up over the last few months. Sometimes letting it go an extra week or 2.
I choose 2 weeks because the media should still be working then. I can change carbon at the same time, and with bulk pricing it is affordable to just change it then instead of worrying if it's still good or not.
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