I work with the nova too, its not the nutes that are clogging and in general the aeroponics have always been a pain in my ass. Everyday it has a problem, I am switching over to a bucket system. I have seen if you grow with a five gallon bucket per plant they love the root space. This is my new project.
I would agree with CANNA and ADVANCED but don't get ripped off by house & gardenGet the red Ez-clone replacement nozzles and you won't worry about clogs. Well if it clogs you can clean it easily. Also, look into a pump filter bag. Another thing, Floranova is not recommended with Aero for that reason if I'm not mistaken. Use Canna or Advanced Nutrients or even House and Garden.