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first post on this site! ...so don't flame me, lol
First, whoever wants to pump tank O2 directly into the waater, i'd be pretty concerned about two issues; one, such an approach might screw up your pH because straight oxygen is pretty reactive, and two the shit is seriously flammable. Imagine what might happen if you got your oxygen partial pressure too high in your growshow and the CO2 burner came on! Plants on da MOON, bro! Not pretty.
I believe in keeping things simple, which is why I'm on this thread to begin with. I am designing an RDWC (recirculating deep water culture) system along the lines of the undercurrent, but at lower cost. In the keeping it simple dept, I am considering the use of waterfall style aerators in the control bucket and reservior instead of airstones in every bucket. Thoughts? Also, where might I find an air venturi, since there are a couple places in my circulatory system where one might easily fit?
On to nutes- I am considering either Advanced Nutrients or General Hydro, as both of them purport to be pH balanced, and I don't have the coin to throw down on a lot of testing equipment right now. pH test strips is about as far as I'm able to go for now. Each 5 gallon bucket in my system will be about 3 gallons full, about 12 of them, and along with the 40 gallons or so in the res and the control bucket means a total water quantity of about 80 gallons, give or take. I want to be able to go three weeks between water changes, would accept two. what are your thoughts? Feel free to PM me.
Not a PM, but I really think you need to consider the no airstone idea. A clogged airstone in some of my older fast water rdwc plants caused root issues and the pump was really fast!
What are your motivations behind the no airstone? Its such a beneficial thing, I cannot see the benefit to getting rid of it. Its really tried and true, unless you are going to go NFT, then I would humbily advise against it. :) If its a noise of the pump issue, the danner ap-100's are pretty quiet and cheap!
If you have any design questions I would love to discuss with you what has works in all of my tinkering, and how to implement that in your system. Again my thinking is along the DD's and Current Culture UC systems. :)