I only change twice. I don't do a lot of dusty gravel road driving. If I did the change schedule would be different. Clean your filter to your driving needs. That is the way it should be done. Otherwise change when dirty.
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I believe Reefkeeping is not a hobby but a way of life It's unfortunate mine is at a stand still!
Building a 135 reef 9 years in the making(seem like I'll never get this 1 together! Too Busy with the Nano and Pico tanks
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