Originally Posted by PalmettoSailor
Another less expensive option would be to use a "fertilizer injector" from Mazzei. These are often used in hot tubs and aquariums and can sometimes be found on E-bay.
Folks on the C36 site have experimented with the 484X, 584 and 684. According to the postings on C36, the 484X worked but resulted in some loss of cooling due to reduced water flow. Replacing it with the 684 solved the problem. Apparently the fellow that used a 584 was happy as well.
I'm considering installing either the 684 or 584 over this winter.
Dragging up an old post...did you ever do this Mazzei modification?