One side effect of using products containing solid CaCO3 particles is that it can purify your water as the fresh CaCO3 surface can bind dissolved organic matter and phosphates (but also "good stuff" like magnesium).
It is generally accepted that elevated phosphate (even lower than many hobbyist kits can measure) hampers coralline algae growth and calcification in general so at least in theory these kind of products can help in an indirect way.
Just my 2 cents
