I love the flexibility of the calcium and alkalinity independently and the knowledge of what is is there as well as the simplicity of mixing the solutions. I use Red Sea A/B/C/D for trace elements, which means 7 dosing heads on my shelf. What are you thinking of using for TE's? I get 5 gal buckets of the raw powders if you ever run low on any of the individual elements and want to mix a gallon of solution.