# What is "super triple phosphate" and is it soluble or not?

I have been working on some detergent formulations and some specifications call for "super triple phosphate". The problem is that the formulations generally require all the inputs to be water soluble and in my experiments with "super triple phosphate" purchased naively, it is not a soluble substance.

So, in other words, I have bought product advertised as "super triple phosphate" which is generally available as a fertilizer, and tried to use it and it does not work because it does not dissolve in water.

So, what is going on here? Some of the possibilities:

1. The written formulations I am working from are simply incompetent BS that do not describe real working detergents
2. There are different kinds of "super triple phosphate", some of which (fertilizer) are not water soluble and others of which are. In this case, I need to know what the soluble form is called so I can find it and order it.
3. The "super triple phosphate" needs to be processed in some way to make it soluble
• Could it be triple superphosphate $\ce{Ca(H2PO4)2}$ (TSP)? Looks like the manufacturer decided to distort the name. Jul 11 '21 at 12:58
• @andselisk Ah hah, that seems to be the explanation. Some of the formulations I am working from come from a non-English speaker, so apparently they just screwed up the order of words. Jul 11 '21 at 13:11
• FMI, you can find the history and usage of the term "super" in this question and you'll find why it might create confusion. The term had been used since antiquity so there is no proper rationale but has become a staple term in agricultural fertilizers. Jul 12 '21 at 8:34