I purchased the large CO2 scrubber from Icecap and it wasn’t working at all. I knew it should be, since the PH would drop whenever my wife and kids were here, dramatically, but it just wasn’t working. I finally went to change out the media and start over after adding water and found the problem. There is a tube that feeds from the bottom of the scrubber so the air goes through the media, well that tube had pushed out when I pushed my air line in. I pushed it back in as best I could (it’s a tight fit and the tube is now cracked) and MAN what a difference. Highest peak for PH is now 8.39.