diff --git a/changelog.txt b/changelog.txt
index 0621323..7f172cf 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,4 +1,9 @@
 ---------------------------------------------------------------------------------------------------
+Version: 0.4.0
+Date: 2021-02-27
+  Features:
+    - New optional intermediates: Silicon wafer
+---------------------------------------------------------------------------------------------------
 Version: 0.3.7
 Date: 2021-02-15
   Changes:
diff --git a/graphics/icons/silicon-wafer.png b/graphics/icons/silicon-wafer.png
new file mode 100644
index 0000000..65bcc8c
Binary files /dev/null and b/graphics/icons/silicon-wafer.png differ
diff --git a/info.json b/info.json
index e3cb46c..19b0565 100644
--- a/info.json
+++ b/info.json
@@ -1,6 +1,6 @@
 {
     "name": "bzsilicon",
-    "version": "0.3.7",
+    "version": "0.4.0",
     "factorio_version": "1.1",
     "title": "Silica & Silicon",
     "author": "Brevven",
diff --git a/locale/en/silicon.cfg b/locale/en/silicon.cfg
index dfa2ef9..c681e48 100644
--- a/locale/en/silicon.cfg
+++ b/locale/en/silicon.cfg
@@ -1,16 +1,19 @@
 [entity-name]
 silica=Silica
 silicon=Silicon
+silicon-wafer=Silicon wafer
 optical-fiber=Optical Fiber
 
 [item-name]
 silica=Silica
 silicon=Silicon
+silicon-wafer=Silicon wafer
 optical-fiber=Optical Fiber
 
 [item-description]
 silica=Can be used directly or processed further.
 silicon=Needed for various electrical and electronic applications
+silicon-wafer=Use silicon in circuits
 optical-fiber=Cable used for fiber optics, including circuit network.
 
 [technology-name]
@@ -27,3 +30,12 @@ fiber-optics=Optical fiber for circuit network
 silica=__ITEM__silica__
 silicon=__ITEM__silicon__
 optical-fiber=__ITEM__optical-fiber__
+
+
+# Settings 
+
+[mod-setting-name]
+bzsilicon-more-intermediates=Enable more intermediate recipes such as silicon wafers. More complex production chains.
+
+[mod-setting-description]
+bzsilicon-more-intermediates=Optional in vanilla, Krastorio 2, etc. Requried for Bio Industries.
diff --git a/prototypes/silicon-recipe.lua b/prototypes/silicon-recipe.lua
index 9c1f5f6..6afba17 100644
--- a/prototypes/silicon-recipe.lua
+++ b/prototypes/silicon-recipe.lua
@@ -60,8 +60,14 @@ data:extend(
     {
       {
         type = "unlock-recipe",
-        recipe = "silicon"
-      }
+        recipe = "silicon",
+      },
+      util.more_intermediates() and
+      {
+        type = "unlock-recipe",
+        recipe = "silicon-wafer",
+      } or nil,
+    
     },
     unit =
     {
@@ -78,3 +84,32 @@ data:extend(
   } or nil,
 }
 )
+if util.more_intermediates() then
+data:extend({
+  {
+    type = "item",
+    name = "silicon-wafer",
+    icon = "__bzsilicon__/graphics/icons/silicon-wafer.png",
+    icon_size = "64",
+    subgroup = "intermediate-product",
+    stack_size = util.get_stack_size(100),
+  },
+  {
+    type = "recipe",
+    name = "silicon-wafer",
+    category = "crafting-with-fluid",
+    subgroup = "intermediate-product",
+    enabled = false,
+    energy_required = 20,
+    ingredients = (mods["Krastorio2"] and {
+      {type= "item", name="silicon", amount=20},
+      {type= "fluid", name="hydrogen-chloride", amount=50},
+    } or {
+      {type= "item", name="silicon", amount=20},
+      {type= "fluid", name="sulfuric-acid", amount=50},
+    }),
+    result = "silicon-wafer",
+    result_count = 10,
+  },
+})
+end
diff --git a/recipe-updates.lua b/recipe-updates.lua
index f650e56..4039671 100644
--- a/recipe-updates.lua
+++ b/recipe-updates.lua
@@ -5,15 +5,15 @@ if not mods["Krastorio2"] then
   util.add_ingredient("concrete", "silica", 25);
   util.add_prerequisite("concrete", "silica-processing")
 
-  util.replace_some_ingredient("processing-unit", "electronic-circuit", "silicon", 10)
+  util.replace_some_ingredient("processing-unit", "electronic-circuit", 10, "silicon-wafer", 5)
   util.add_prerequisite("advanced-electronics-2", util.silicon_processing)
 
-  util.replace_some_ingredient("solar-panel", "electronic-circuit", "silicon", 10)
+  util.replace_some_ingredient("solar-panel", "electronic-circuit", 10, "silicon", 10)
   util.add_prerequisite("solar-energy", "silicon-processing")
 
-  util.replace_ingredient("effectivity-module", "electronic-circuit", "silicon")
-  util.replace_ingredient("productivity-module", "electronic-circuit", "silicon")
-  util.replace_ingredient("speed-module", "electronic-circuit", "silicon")
+  util.replace_ingredient("effectivity-module", "electronic-circuit", "silicon-wafer")
+  util.replace_ingredient("productivity-module", "electronic-circuit", "silicon-wafer")
+  util.replace_ingredient("speed-module", "electronic-circuit", "silicon-wafer")
   util.add_prerequisite("modules", util.silicon_processing)
 else
   util.add_ingredient("concrete", "silica", 15);
@@ -48,9 +48,15 @@ util.add_prerequisite("circuit-network", "fiber-optics")
 util.add_prerequisite("circuit-network", util.silicon_processing)
 
 if mods["Krastorio2"] then
-  util.add_prerequisite("kr-silicon-processing", "silica-processing")
   util.add_ingredient("biusart-lab", "optical-fiber", 10)
   util.add_ingredient("ai-core", "optical-fiber", 2)
+
+  util.add_prerequisite(util.silicon_processing, "silica-processing")
+  if util.more_intermediates() then 
+    util.add_effect(util.silicon_processing, {type = "unlock-recipe", recipe="silicon-wafer"})
+    util.remove_ingredient("electronic-components", "silicon")
+    util.add_ingredient("electronic-components", "silicon-wafer", 1)
+  end
 end
 
 if mods["aai-signal-transimission"] then
diff --git a/settings.lua b/settings.lua
new file mode 100644
index 0000000..8864bb1
--- /dev/null
+++ b/settings.lua
@@ -0,0 +1,10 @@
+data:extend(
+{
+  {
+		type = "string-setting",
+		name = "bzsilicon-more-intermediates",
+		setting_type = "startup",
+		default_value = "no",
+    allowed_values = {"yes", "no"},
+	},
+})
diff --git a/util.lua b/util.lua
index b731c6b..b2f72cf 100644
--- a/util.lua
+++ b/util.lua
@@ -2,6 +2,17 @@ local util = {}
 
 util.silicon_processing = mods["Krastorio2"] and "kr-silicon-processing" or "silicon-processing"
 
+function util.get_setting(name)
+  if settings.startup[name] == nil then
+    return nil
+  end
+  return settings.startup[name].value
+end
+
+function util.more_intermediates()
+  return mods["Bio_Industries"] or util.get_setting("bzsilicon-more-intermediates") == "yes"
+end
+
 function util.get_stack_size(default) 
   if mods["Krastorio2"] then
     size = tonumber(krastorio.general.getSafeSettingValue("kr-stack-size"))
@@ -92,26 +103,32 @@ end
 
 
 -- Replace an amount of an ingredient in a recipe. Keep at least 1 of old.
-function util.replace_some_ingredient(recipe_name, old, new, amount)
-  replace_some_ingredient(data.raw.recipe[recipe_name], old, new, amount)
-  replace_some_ingredient(data.raw.recipe[recipe_name].normal, old, new, amount)
-  replace_some_ingredient(data.raw.recipe[recipe_name].expensive, old, new, amount)
+function util.replace_some_ingredient(recipe_name, old, old_amount, new, new_amount)
+  replace_some_ingredient(data.raw.recipe[recipe_name], old, old_amount, new, new_amount)
+  replace_some_ingredient(data.raw.recipe[recipe_name].normal, old, old_amount, new, new_amount)
+  replace_some_ingredient(data.raw.recipe[recipe_name].expensive, old, old_amount, new, new_amount)
 end
 
-function replace_some_ingredient(recipe, old, new, amount)
+function replace_some_ingredient(recipe, old, old_amount, new, new_amount)
 	if recipe ~= nil and recipe.ingredients ~= nil then
 		for i, ingredient in pairs(recipe.ingredients) do 
-			-- For final fixes
 			if ingredient.name == old then
-        ingredient.amount = math.max(1, ingredient.amount - amount)
+        ingredient.amount = math.max(1, ingredient.amount - old_amount)
       end
-			-- For updates
 			if ingredient[1] == old then
-        ingredient[2] = math.max(1, ingredient[2] - amount)
+        ingredient[2] = math.max(1, ingredient[2] - old_amount)
       end
 		end
-    add_ingredient(recipe, new, amount)
+    add_ingredient(recipe, new, new_amount)
 	end
 end
 
+-- Add an effect to a given technology
+function util.add_effect(technology_name, effect)
+  technology = data.raw.technology[technology_name]
+  if technology then
+    table.insert(technology.effects, effect)
+  end
+end
+
 return util