You won't need nutrients for pre-soaked clover seed sprouts; commercially open topped trays are prone to spot contaminant when temps. rise & home recycled narrow mouth containers often poorly circulate air inside .
You can make grow "sacks" out of cut up old open weave cloth ( like some tee-shirts), rubber bands will hold the gathered ends closed, then 2-3X/d submerge the seed bundle into water & hang it to drain ; a weeks series of these are easy to plunge & cloth cleans up easier than anything.
(Must mechanize: have a timer fill a tub with water & also timer drain that tub, with your rack of sprout sacks hanging passively inside the tub confines ... for engineering wizards: timer raise & lower the rack of sprout sacks into a tub full of water.)

Not sure if this is what you're looking for, but here is a link to starting your own sprouts for consumption purposes.

If you're looking to go hi-production or have a continuous cycle of available sprouts, you can try build one like this. It takes a bit of set up, but that's half the fun... With the addition of a timer, it makes growing your sprouts a pretty much hand-free, automated process for anything from alfalfa to wheatgrass or mushrooms, if so interested...

Here is a link that might be useful: Sprouter Photos