I just had to clean out my neutralizing tank (calcite) and re-bed it with the gravel that was in there and added back 1cu ft of calcite....the tank is about 1/4 full?....should I add another cu ft???....the tank measures roughly 12"wide by 48" tall. It is a upflow neutralizer seen in the attachment

Image: [img]icon_paperclip.gif[/img] finishedproject.JPG
67.93KB