Is that pump for circulation in the res, or is it one of the fill/drain pumps?
Sorry, I'm not quite understanding where this aerator is, but I'm interested in the idea. You can never have too much dissolved oxygen in that res.
My bad. Recirculating. I used to move massive amounts of air but had issues so instead a friend suggested I use a recirculating with a venturi (airline). I currently have ten in veg under 2k they will be moved in about three weeks to flower where they will be under 3k . I went with multiple Titans to make it easier for switching cycles.
Just a few oxygenation/aeration thoughts...
With a system like the Flo N Grow, there really isn't a
need for added dissolved oxygen (DO). I liked the idea of keeping things in the reservoir
recirculated a bit, but the plant roots get the aeration from the drain cycle and in between floods - where they are constantly exposed to air. There is a limit to benefit from DO, not that excess would necessarily be bad - just not adding more benefit.
I used to use a recirculating pump in my reservoir, but it added a small amount of heat so I removed it (though the heat was only an issue in the summer months). I did like it otherwise.
Currently I have a couple of airstones in the reservoir because I like the small amount of recirculation they provide, but the added DO isn't essential. It may provide
some benefit, but certainly not necessary either. I've run my reservoir so far with a recirculating pump (like you are doing nmherbman, but without the aerator attachment), with airstones, and with nothing at all. There has been very little difference between the three. I thought maybe I got a little better results with the airstones, but I'm not as sure anymore. The grow I had with no pump or stones or anything in the reservoir was a good grow, too. One of the best hydro growers I've known, Mr. Smith, has grown hundreds of plants in systems like this with no added aeration to the reservoir. This is a guy who has grown plants that weigh around a
pound, and someone who's been there, done that with almost every form of hydroponics.
I just wanted to address this topic a bit further because there are many misconceptions about oxygenation in flood-style hydro, as a result of DWC logic being applied to flood/drain scenarios. One of the great benefits of a system like the Flo N Grow is that they give incredible root zone aeration, without the need for airstones. The floods themselves serve to keep the roots wet and constantly exposed to air without being continuously submerged. If you think about it, they are "aerated" all day long, except for the times they are briefly flooded.