DWC Raft Construction Update #2

OK...so I have finished hooking all the components up for the new DWC rafts in system 2. All is working according to plan. The only adjustment I had to make was to the riser tube coming off the bottom of the FT's. I had to shorten it by 1" as I was having an overflow problem in one of the FT as the ebb/flow grow bed were draining. Easy fix, with a hacksaw and 2" coupling. I have also built a weather protective box for the pumps and air blower. I still need to paint it to match the greenhouse...shouldn't take more than a couple of hours to paint.

I have included a video overview of the system so far....

  I purchased 4  - 4' x 8' extruded polystyrene 1" foam sheets from Home Depot for use as my rafts. I then cut these into 4' sections and drilled 3" holes, using a hole saw, in each to accommodate 3" net cups.

 I have 5 rafts that each have 36 holes on 8" centers and I have 3 rafts that have 16 holes on 12" centers. This gives me a total of  228 holes for plants in both rafts combined.  The 8" center hole rafts will be used for leafy vegetables such as lettuce, Kale, Greens, and Herbs, while the 12" center rafts will house tomatoes, cucumbers, squash, peppers, cauliflower, and broccoli.   I had to paint the tops with a latex based paint to provide some protection from the UV rays of the sun.

All painted up and installed in the rafts.

I also drilled 1" holes about every 2' for air stones coming off the 1" PVC airline running down the middle of the rafts. As you can see from the photo, there are plenty of bubbles coming up against the rafts.

After completing all of this work, I noticed that the top layer of weed block was breaking fairly rapidly in the sun, so I decided to lay down UV resistant tarps over the weed block, hopefully I will get a couple of years use out the tarps before they need to be replaced.

 Ultimately, I will be placing pea gravel down over the weed block, but no time for that now...I'm off to get some Mozambique Tilapia at Overton Fish Farms....

Next up ....the Tilapia.

The sewing of Romaine Lettuce and Collard Greens

Aquaponics is amazing....after sowing several dozen Romaine lettuce seeds of various varieties. I was surprised to find that after 3 days most of the seeds had sprouted. This is truly amazing considering that normal germination for these seeds type is 7-10 days. I also did the same with a pack of Collard Green seeds and unexpectedly these also sprouted in 3 days while normal germination is 10-21 days. I have included a few photos to show the new babies.

 You can see the new lettuce sprouts next to the new Bell Pepper plants in the pic above.

 A closer view, I'm going to have to cull a few of these as they get bigger.

And yet more....

Here is a shot of the collard sprouts.

I also had a Basil harvest this past weekend due to the fact that the plants were starting to get lengthy and falling over. I cut these back and dried the leaves. I still have quite a few younger plants for fresh cut leaves when needed.

Next post  to follow will provide an overview the new solar hot water panel I put together to heat the fish tank water.