They never cover everything in a kit and most of the time kits are a bit lacking in quality components to say the least ,If it were me buying this kit I'd make sure that the products were the right price and quality that is right for a good healthy Grow ...
Compare the prices against buying the components seperatly and If the Kit works out cheaper and the quilty is right then your on a winner ...
That is not a hydro kit. It is put together for you to hand water your growbags with coco.
They may have hydro kits, but that one is not it...though it does look pretty complete if you don't mind watering by hand.....which I would recommend anyway if it's your frst grow.