diff --git a/chemistry/ta4_doser.lua b/chemistry/ta4_doser.lua
index ca99fb9..bf9abec 100644
--- a/chemistry/ta4_doser.lua
+++ b/chemistry/ta4_doser.lua
@@ -113,6 +113,9 @@ local function start_node(pos, nvm, state)
 	reactor_cmnd(pos, "start")
 	del_liquids(pos)
 	nvm.running = true
+	local mem = techage.get_mem(pos)
+	mem.waste_leftover = nil
+	mem.output_leftover = nil
 end
 
 local function stop_node(pos, nvm, state)