I am currently using the ESV product in my tanks. I am also using kalkwasser mixed with vinager that is proving to be most affective. I use 180ml of both A and B. And then dose slowly at night one gallon mixture of kalkwasser. Using a one gallon container I add 2 tsps of ESV kalkwasser and 60ml of white vingar and then RO DI water. This combo is working GOOD!
Jim