i should have said , fuel ions, and calcification are the only products i can reccomend. i havent used the others. i used the calcifacation to bring my calcium up to my desired level and have been dripping kalkwasser ever since.these products are really too expensive to keep a large system dosed. i have a hard time spending $60 or more on 4 of the products when i can achieve the same results for pennies.