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Hi David, Here is 2 links, you might also find of intrest...
Can you tell me the size of the holes spacing in the screen?
Chris Smith said:
Aloha, I currently have three raft systems operating. On two of then I use a simple clarifier/net tank system. These are commercial systems that have a high density of fish. In large tanks of well fed fish that are growing, it is very hard to estimate the pounds of fish. With the higher density of fish I found it is better to remove the solids before they get to the first plant roots. I flush my clarifier once a day on my morning fish feeding and feed the waste to my bananas, papayas, and coffee trees. They love it! The small particles that are caught in the net tank are consumed by a water flees called gammarus, midge fly larvae and I even have some composting worms in it. There is no cleaning of the net tank required.
My small system does not use any filtration at all because I am careful to keep the density of fish low. With a small tank I can monitor the pounds of fish much more easily than in the big tanks. Low density is considered .3 pounds/square foot of raft space. On my micro system of 64 sqft I have 20 lbs of fish. The bacteria is able to consume all the fish waste. I do use a much smaller screen mesh on the piping leaving the tank and a blubber directly below it. The small mesh screen only allows small particles through. The bubbles below the screen keeps bigger particles from accumulating rapidly and helps break big chunks down to smaller ones.
I'm just seeing this now. I have 3" pipe that flows from one IBC tote (fish tank) to the next with a1/2" plastic screen as well..but that is what got clogged up a bit..the roots were huge on the plants that I put in the tanks and for some reason they didn't eat all and some broke off and clogged it up a bit..maybe they weren't hungry enough. the pipe coming out of last FT is 2". I still like the idea of it and would try again.
Michelle Silva said:
Chris,I don't have net tanks. The system is set up returning from the last fish tank back to the raft tanks as gravity feed. The problem is the way it's designed now, the water level would be higher if I incorporate the gravel beds at the beginning of the raft tanks or (to place just out of the fish tanks would be tricky too, the last IBC tote is buried a little into the ground)and would no longer gravity feed..it's a bit hard to explain.
I would design it different if I did it again,would build the raft tanks out of wood and raise them i/o two cinderblock high on ground and probably put the fish tanks in the ground. That would also allow the vertical return to drain directly into the last fish tank i/o the small pump that is at the end of the long vertical tower trough.. It's crazy, I have three pumps already! There were solenoid issues (not having enough presssure to open one and close the other) to be able to send water over to the vertical stacks using one pump,,was easier to just add a second pump. However, just this week I spoke to a plumbing supply house here and learned about a no pressure switch (think that's what it's called) that will work,but it would cost another $100 or so to get that set up and I already have the other pump.I am seeing some oil and was thinking it might be from the second pump that was just bough locally at Home Depot. It's concerning me, so was looking at more options.
Could you explain more how you have it run out the gravel beds? I was originally wanting it to be flood and drain so the worms could be in there. Is there a constant level in yours?
Chris Smith said:
Michelle, I was able to integrate my gravel beds into my systems easily as gravity is doing the work. It was as simple as replacing net tanks with beds at the proper height. If you cannot add them into your system in this fashion you can always use a separate pump to feed the beds. I will soon being adding new beds that will be fed by a pump in one of my troughs. Worms are great for media, just be sure to use worms that have not been fed any manure in recent months.
I have never had a problem with roots clogging anything when feeding roots to the fish. I use 2" and 3" pipe for drains and 1/2" plastic mesh to keep fish in their tank.
I now use black cinder as my medium. I have had problems with bad blocks of coir. The cinder has many advantages over coir. I will be posting about my new method very soon.
Just thought I'd throw this out there:
We've started live sales at our local natural foods store and have now started supplying restaurants and individuals as well using out restaurant stands. Our live sales are done through this display (see attachment) at market, no pics yet our our restaurant display. So far we've found that folks are willing to pay roughly 50% more than organic pricing to cut their own herbs and greens. Since our wholesale prices have a 50% markup at the retailer, we're able to get monster wholesale prices for our produce. Same with restaurants. The beauty is that it eliminates all of the labor/packaging costs associated with our harvest and packaging, which is huge for us. I think that anyone interested in commercial aquaponics should look at live sales and live restaurant sales to increase your margins, both from cost eliminations and higher prices at market.
I'll jump in here for a moment since I don't know if Nate is getting e-mail notices of posts. I asked him about circulating. Yes there is a tank under there and circulation through the towers but I don't believe there are any fish involved at this point, just enough water to keep the plants fresh.
He did mention that the plants would only do in there for so long as the lighting isn't enough for growing.
But it does sound like a terrific solution for your situation. Probably just need to figure out how to suspend your plants/net pots in something sorta vertical and make sure that enough flow gets to all the roots. This is where the towers are really handy (less handling, then again, Nates towers don't really make it easy to replace one plant at a time as they get harvested) but I'm sure you ladies can figure out something that would work. I know you have the carpentry skills to make it look pretty.
looks awesome nate! Do you mind going into a little more detail on how you sell living produce to restaurants? Id love to get info on this.
Green Acre OG, it sounds like your taking living produce to the farmers markets; Would you mind elaborating on how you do that? There are no living herbs or salad greens being sold at our farmers market, so i think this could be a good nitch for me.