Wynette, gilavina, and DMRippy~
There are fodder systems available commercially that unfortunately are WAY more money than most of us can/would spend...entire trailers with fully automated watering/humidity/temperature control, etc. The FarmTek ones are just a rack system and a person could do it themselves for way less. Just search "fodder systems" and see all the ingenious ways people have come up with.
For our flock, we supplement with barley fodder as it seriously helps with the commercial feed costs and as a natural healthcare practitioner I strongly support organically grown, whole, fresh food for everyone. Of course the barley or other fodder does not have a complete nutrient profile so we use some Exotic Bird Formula sprinkled on there to help balance out the vitamin (and especially) mineral profile. (PM if you want to know where/how to get that.)
We have a layer flock of 12, breeder pens totalling 12, and youngstock totalling 14 birds each. We also used the barley fodder for chicks after one month and to help grow out Cornish X and Red Ranger meat birds. We use the nursery trays and a pump-up spray bottle. Trying to douse/drain was leading to a lot of mold/fermentation. It's near freezing at night here, no basement, and so in winter we do this on a stacked shelf system in the living room. In summer we had the shelves outside on the north side of the house so it didn't dry out/cook in the sun. We sprayed it with a fine mist several times a day and let it drain onto the ground (no bottom trays to catch the extra as we do inside).
Things we have learned: buy seed barley, not feed barley. Misting several times a day works better for us than soak/drain. Room temps work best or down to 50 minimum. Many people use a dilute bleach solution initial soak to cut down on the mold but we don't want toxic chlorine in the house/feed. I have used a tiny drop of good tea tree oil in the initial soak when we were having mold issues (but that was feed barley and going to the mist method with seed barley took care of it completely).
Hope this helps. The birds LOVE the fodder and are hilarious chasing and grabbing it out of each others' beaks!