If you mean the Tempest in the clips where I'm playing Catalyst, then yes Fire + Water. Although some older clips might still have Earth + Water as we only changed that recently. That's also the build I'm playing in the Tempest clips before we changed it. That Tempest build doesn't have a lot of cleanses, mostly overload water and signet. Other than that, our Firebrand has some cleanses as well.
Our Catalyst build brings a lot of boon support (Resistance, Stab, Protection, Quickness) and auras (Magnetic aura especially) but also giving ice auras for our Tempest to transmute. Since it's in Minstrel and has a staff it also has all water healing available but it's not the main healer. The build is very built around working with the rest of our comp. Build is here: en.gw2skills.net/editor/?PGlAYZlZkxu6aYhNt02boeWTrxfA-DWJYjRV/hEkQpOJQ6qCHeDIEhZ/8Wo/SDA-w