Low-dose Fertilizing in Automated System

[Pilot]

I grow in a grow tent-- the lights are T5s and are up high-- high enough that they don't get hit by my auto misting system that kicks off at "sunrise" every day and "rains" on my plants for 30 minutes. I grow many vanda types and (yes I know they're considered vandas now but...) neos that despise fertilizer in too high of doses-- but rather-- seem to enjoy a very low dose with frequent fertilizing rather than a scheduled spike in plant food. My system works pretty well-- the plants are pretty well drenched in the end and I would love to add an injector to my line several times a week to provide this low does fertilization.

I have looked at siphons but they suck up too much water too fast and I'm afraid I couldn't control the dosing. I looked at minidos but my collection is small and those suckers are pricey. So i was thinking I need to do some testing-- possibly getting a siphoning device and regulating it's uptake but restricting it's flow by crimping the line or using a hose end that is actually used for spraying, but would be used in "reverse" instead.

Looking for some input from others' experiences who have done or tried such a thing. The plants that would get this dosing would also be watered by a second line that would not have any fertilizer-- I want to prevent any build up of salts. My hope is that at low doses and then frequent "flushing" of RO water, salt build up will be held to a minimum.

I can't be the only person needing or wanting something like this-- so let's hear what others have done. Thanks!

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