You'll also need some cleaner, i used
Carbsonic ultrasonic cleaner for carburettors ( the red stuff) , not cheap, but you dilute it and it goes a long way
Also the instructions ar'nt to clear, if you want a hot clean, you have to heat the tank first and then set the fizz time
otherwise its fizzing and heating at the same time, and the tank may not get to the temp you want
I got my zorst flap in my unit with no problems