Abstract: A portable toilet chemical recharge system and method includes a water source and a main conduit with a water valve, and a liquid chemical solution source with a chemical conduit and a chemical pump, the chemical conduit connected to the main conduit downstream from the water valve. A chemical pump timer engages and disengages the chemical pump, and a chemical flow control valve controls chemical flow through the chemical conduit. The water valve, chemical pump timer and the chemical flow control valve cooperatively control flow through the main and chemical conduits to provide a pre-injection water flush period, a liquid chemical injection period wherein liquid chemical flows into the main conduit, and a post-injection water flush period.