Grizzle245

Hi all Just looking for advice. Around my septic tank it was cutout into a slope it's a good 30 degree slope around it the drop is about 800mm. What should I use to fill it ? All I seem to be able to get is type 1 subbase, that I believe is not very good for drainage but as the tanks cemented in anyway I wouldn't think it would be an issue. The neck has been extended and shuttered in