There is often more than one way to deal with a water treatment problem. The discussion in this thread makes that point quite clear. Even when the chosen treatment method is chlorination there is more than one way to chlorinate. Gary Slusser is a strong proponent of inline pellet erosion feeders to chlorinate. While I have posted information that, in my view, undercuts two of the advantages that Gary cites for pellet systems I agree with him that they work and that they have some advantages over solution feeders.
I believe that solution feeders also have some advantages over pellet systems and on balance are preferable. However that is my opinion--it is not a fact any more than Gary's belief that pellet systems are preferable is a fact.