diff --git a/chemistry/ta4_doser.lua b/chemistry/ta4_doser.lua
index 3f33343..eafdda8 100644
--- a/chemistry/ta4_doser.lua
+++ b/chemistry/ta4_doser.lua
@@ -177,9 +177,35 @@ local function dosing(pos, nvm, elapsed)
 			end
 		end
 	end
+	
+	-- check leftover
+	local leftover
+	local mem = techage.get_mem(pos)
+	if mem.waste_leftover then
+		leftover = reactor_cmnd(pos, "waste", {
+				name = mem.waste_leftover.name, 
+				amount = mem.waste_leftover.num}) or mem.waste_leftover.num
+		if leftover > 0 then
+			mem.waste_leftover.num = leftover
+			State:blocked(pos, nvm)
+			return
+		end
+		mem.waste_leftover = nil
+	end
+	if mem.output_leftover then
+		leftover = reactor_cmnd(pos, "output", {
+				name = mem.output_leftover.name, 
+				amount = mem.output_leftover.num}) or mem.output_leftover.num
+		if leftover > 0 then
+			mem.output_leftover.num = leftover
+			State:blocked(pos, nvm)
+			return
+		end
+		mem.output_leftover = nil
+	end
+	
 	-- inputs
 	local taken = {}
-	local mem = techage.get_mem(pos)
 	mem.dbg_cycles = (mem.dbg_cycles or 0) - 1
 	
 	for _,item in pairs(recipe.input) do
@@ -203,13 +229,13 @@ local function dosing(pos, nvm, elapsed)
 		end
 	end
 	-- waste
-	local leftover
 	if recipe.waste.name ~= "" then
 		leftover = reactor_cmnd(pos, "waste", {
 				name = recipe.waste.name, 
-				amount = recipe.waste.num})
-		if not leftover or (tonumber(leftover) or 1) > 0 then
-			untake(pos, taken)
+				amount = recipe.waste.num}) or recipe.waste.num
+		if leftover > 0 then
+			mem.waste_leftover = {name = recipe.waste.name, num = leftover}
+			mem.output_leftover = {name = recipe.output.name, num = recipe.output.num}
 			State:blocked(pos, nvm)
 			reactor_cmnd(pos, "stop")
 			return
@@ -218,9 +244,9 @@ local function dosing(pos, nvm, elapsed)
 	-- output
 	leftover = reactor_cmnd(pos, "output", {
 			name = recipe.output.name, 
-			amount = recipe.output.num})
-	if not leftover or (tonumber(leftover) or 1) > 0 then
-		untake(pos, taken)
+			amount = recipe.output.num}) or recipe.output.num
+	if leftover > 0 then
+		mem.output_leftover = {name = recipe.output.name, num = leftover}
 		State:blocked(pos, nvm)
 		reactor_cmnd(pos, "stop")
 		return
diff --git a/liquids/filler.lua b/liquids/filler.lua
index 2375e9b..842bd90 100644
--- a/liquids/filler.lua
+++ b/liquids/filler.lua
@@ -124,6 +124,7 @@ minetest.register_node("techage:filler", {
 	on_rotate = screwdriver.disallow, -- important!
 	paramtype = "light",
 	sunlight_propagates = true,
+        use_texture_alpha = techage.CLIP,
 	is_ground_content = false,
 	groups = {cracky=2, crumbly=2, choppy=2},
 	sounds = default.node_sound_defaults(),