Whenever you come on board, you're going to want to test your water with our free chlorine test strips. If you find that your free chlorine is not holding and your treatment is only lasting several days or a week and your free chlorine is dropping quickly, that means that you might have a more significant problem going on and you have a lot of buildup, a lot of bacteria in your tanks.
At that point, you're going to want to use something like the Aquamarine Shock Biofilm Eliminator. This product will get your tanks clean and free of biofilm or anything that’s built up in the plumbing system. This shock treatment will help maximize the effectiveness and longevity of your Aquatabs Marine treatment. After this Shock Treatment, you should be getting several weeks use out of your treatment.