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Discussion Starter · #1 ·
Every time I open up my Eheim 2213 filter to clean/replace media/whatever, when I start it back up again it blows an insane amount of gunk into my tank that I then have to do a water change to remove. Why does this happen and is there any way to prevent it? I have to take carbon out of my filter soon and I'm really dreading it ):
 

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its buildup in your pipes/tubing back into the output. Its not that big of a deal and wont harm the tank. Ultimately its probably beneficial bacteria. Just let the filter clean it out. But i usually change my filters out and then do a water change anyways
 
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