Maybe of interest if considering what shower media to use : Koi Talk
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Thought this might be of interest.
Having bought some second hand bhm recently, I decided to give it a clean by soaking under water in a strong pp solution. Now as I did this I thought it maybe helpful to see how the water penetrates the ceramic media and thus how much area there is for bacteria to work its magic while working in a filter. I also had two other ceramic medias so soaked a sample of them as well for about 30 hours submerged as the bhm in pp. I then broke the three samples apart to see how far the water had penetrated which was clearly shown by the brown staining of the pp.
Now hopefully I can show the results here. I am surprised at the results.
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