I don't get salt buildup, funnily enough, unless I use miracle-grow type of fertilizer. Maybe it is from using Osmocote, or maybe I just grow enough algae and bacteria to consume nutrient run-off.
Flats are quick and easy to water. Most of my plants will be in larger pots, and I let them soak until saturated, especially bigger plants in hot weather. I leave pots in water overnight quite frequently. I don't think I could grow dwarf sunflowers in trade size gallons if I top-watered.
I am at the point of being slightly profitable, but it takes up all my time. As soon as I can build an automated slightly profitable greenhouse, then I can justify building more of them.
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