Thank you ABurningMouth. Yes I am a fast learner but I am sure that there is much more I can learn to make some of my stuff look a little better and be easier ways of doing things. I am going to watch more of the videos and see what I can learn.
Explain the system a bit. It looks very complicated. Also remember to subtract the volume that your media will take up
Its actually not complex at all. So the 55 gallon under the table holds the water. As you can see there are 4 tubes coming out of it and going into the flood table. Now even though in the 3d it looks like 1 table there will in fact be 2- 6' x 3'flood tables butted end to end. So the 4 lines is 1-pump line and 1-overflow line per flood table. The trick in doing this is to set the pump on timers in a way that one table gets flooded at a time with all of the same water. That should explain that but if it doesnt feel free to ask any questions. Im no hydroponic pro but I got the bite and I think a system like this would work quite slick especially with conserving water and using rain water.
So on that note the integrated rain barrel. Well that is even more simple Have something on top to filter all the sand, leaves, etc. ie screen or something. Anyway the rain gets collected into the barrel and now you get to use the most natural and for the most part cleanest water available for your plants. Once it is time for the old water under the table to be changed out I can turn the valve on the bottom of that barrel to drain it all out. Once drained then I can close the valve back up and open the rain barrel valve to fill the other drum with rain water. If I don't have enough I can just use the home to fill the rest. I know it seems odd to use the hose if the whole reason is to use rain water but we cant always be blessed with an abundance of rain water.
Just a side not in case some of you looking at the pics may not know, though I am assuming all or almost all of you do know, that vertical tube on the barrel under the table is so I can see what the water level is in the barrel and thus would not require me to make another hole in the barrel just to look in and see.
Hopefully this answered some questions for you but if you got more feel free to ask and I will answer them the best I can. Today since it is slow at work I also created a 3D version of a "grow shelf" idea I have. Nothing really special but it is cool
As for the amount of water and counting for media, I mentioned that in the first posting that I put a pic in. I said I would need 55 gallons but considering I will be using Hydroton I will need much less.