Do not use TSP! Use sodiumtrippolyphosphate, aka STP, STPP. TSP is as caustic as lye. You can find STP on Amazon. Mix 30% STPP with powder for hard water.

Do not use TSP! Use sodiumtrippolyphosphate, aka STP, STPP. TSP is as caustic as lye. You can find STP on Amazon. Mix 30% STPP with powder for hard water. 10% for soft water.