Jacks or other?

[Rio_Grande]

Hello
I am contemplating a raft or nft system for growing lettuce and greens. We use a water soluble fertilizer in our dirt garden but it has no trace minerals in it. I have read that jacks is a good choice. But haven't ever done this before.

We are doing this for production purposes to help extend our greens season. I am not interested in the high priced nutrients. Lettuce doesn't pay as much as some other hydro crops and I can't justify paying what a lot of grow shops have for nutrient.

Any recommendations will be appreciated.