Jul 28, 2021 #1 mamareef Community Member View Badges Joined Jun 26, 2021 Messages 37 Reaction score 23 Location San Diego Rating - 0% 0 0 0 I am trying to understand my filter media! (Sorry, super newbie over here!) the black stuff is… carbon? But what is the brown stuff? Last edited: Jul 28, 2021
I am trying to understand my filter media! (Sorry, super newbie over here!) the black stuff is… carbon? But what is the brown stuff?
Jul 28, 2021 #2 banger32 Active Member View Badges Joined Aug 23, 2019 Messages 375 Reaction score 292 Location Bradenton Rating - 0% 0 0 0 K thanks. Have a good night
Jul 29, 2021 #3 Gtinnel 10K Club member View Badges Hospitality Award My Tank Thread Joined Mar 20, 2020 Messages 21,075 Reaction score 29,650 Location Charleston, WV Rating - 0% 0 0 0 Based on the color of the bag my guess would be that you are right and the black one is carbon, and the brown one may be GFO (granular ferric oxide) which absorbs phosphate from the water.
Based on the color of the bag my guess would be that you are right and the black one is carbon, and the brown one may be GFO (granular ferric oxide) which absorbs phosphate from the water.