I have used them for 5 years. ran as many as 28 but now 8 under 2-1000w.
I use Canna coco with perlite, Canna A+B, Rhizotonic, Cannazyme, Calmag, PK 13/14, and BudXL.
I don't use the valves for the first couple of weeks in flower. I handwater til then.