short..
you use zeovit stones in a reactor, and use bacterie and fuel to keep a cultur of bacteria to achive ULNS in your system (zeobak, zeofood and zeostart). The product also has a line of additives that is used to improve coral health like sponge power, and coralvitalizer (they are more or less coral foods), with amino acides. Then you have a range of products to fine tune the color, like b-balance, k-balance, pouls xtra, stylo poci glow, zeospur.
many of the additives can be used with out zeovit, but you need low nutriens in your system, before using them. I used to run zeo for around a year, but i got tired of all the work. The system is effective, but also can get expensive fast, now i use a sulfor based filter, along with vsv, and i just a few of the zeo products still. mostly:
amino, stylo poci glow, b-balance, pouls xtra, coral vitalizer and sponge power.
this is just one way out of many ways to run a system.