Nice. Thanks. One thing tho - I wasn't sure about which of the recipes should be disabled, this new or Krastorio's, since there's collision now. I hid the new one.
I added this with 0.6.5/0.6.6. I did change the recipe to be 100 + 50 water, since landfill costs 50 stone and that made sandfill an objectively better recipe assuming you have access to water, and reduced the cost for landfill to 40 stone, so that sandfill being a better recipe is still achievable.