My DWC Grow Guide Draft, critique, correct?

Fuzzotany

Well-Known Member
My A to Z on it

SUPPLIES:

1) Rubbermaid container (4-5 gallon per plant) – DARK so little light gets through – if some does you will need to paint or tape over the box’s outside to block it.
2) Air pump exceeding the capacity of the container (40 gallon pump for a 25 gallon jug) – dual outlet reccomended
3) Air tubing (8-10ft)
4) “T” attachment for air tubing (only if using single outlet pump)
5) Two air stone strips (should be more than 12” long)
6) Hydroton clay pellets (little balls of expanded clay)
7) Rockwool cubes
8) Net pots (look like little cups made of mesh) 2” to 3”
9) PH liquid tester for water (litmus strips work too)
10) Lights: CFL, Metal Halide, High Pressure Sodium - CFL and MH are good for Veg, HPS is best for flowering
11) General Hydroponics 3-Part System (look it up online)
12) Ph up & Ph down (liquid)
13) Electric timer
14) Optional – to ease draining you may want to buy a drain valve and pvc glue to make a drainage system.


RULES:

1) Water should be 5.5ph – 6.0, if any higher/lower, fix it.
2) Ph should be adjusted AFTER adding nutrients
3) Water temps should be 60-70F – ice packs can be used in water.
4) Plant temps should be around 75-85F
5) Distilled water should be used whenever possible. Filtered waters can be used – be weary of those that add fluoride as this can kill plants.
6) Lights should have a rating of 2700K to 6500K (this is Kelvin scale – should be on every bulbs box)
7) Follow nutrient directions
8) Clean the bucket every time you change the water/nutrient mixture. A wipe down with a clean rag should suffice.
9) Lighting should amount to 7,500 to 10,000 lumens per sq ft.

SETUP:

1) Use a hole saw and make holes for in the lid of the rubbermaid container for your net pots (SAFETY NOTE: MANY HOLE SAWS OVER 2” WILL NOT FIT INTO MOST BATTERY POWERED DRILLS. CORDED DRILLS ARE EXTREMELY POWERFUL. IF YOU HAVE NEVER USED ONE REMEMBER THEY ARE DANGEROUS AND WILL FLY OUT OF YOUR HAND IF THEY ARE NOT VERY STRONGLY SECURED WHEN BEING USED AND WILL SHRED WHATEVER THEY HIT BEFORE THE BLADE STOPS.
2) Drill a hole for your air tubing
3) Align Airstones in your reservoir for even distribution of air bubbles over the surface of the water (suction cup airstones work well for this)
4) Mark the level of your net pots bottom inside the reservoir, this will be your water fill line, calculate the amount of water used to fill it to that mark and use that to define your nutrient concentrations.



PROCESS:

1) Germinate seeds – this is easily accomplished by keeping seeds in a moist (not soaked) paper towel in a warm, dark area.
2) When you see little roots sprout from the seeds, transfer them into rockwool, keeping the root pointing down near the bottom of the cube.
3) Rockwool should be watered lightly in 5.5PH water from time to time to keep it moist
4) Seedlings will sprout, when they do put them under the light of 1 CFL that’s always on. Note: 2+ CFLs for 6 sprouts, and the lights should be kept no further than 2 inches from the seedlings to prevent stretching.
5) When roots pass through the rockwool, place seedlings into the system (do not add nutrients yet, but PH the water)
6) After the plant gets its second set of leaves, it should be okay to start adding nutrients to the mix at 1/4 strength
7) When the plant gets a little bigger you can start adding more light, CFLs should stay close, metal halide should be kept about 7” away.
8) After you’ve had the lights on 24 hours a day for about a week, switch to an 18on 6off light cycle.
9) Over the course of a month, gradually raise the nutrients to 75% of their suggested value.
10) Watch your plants grow, if you want to give it a shot move up to 100% of the suggested nutrient value, be weary of yellowing leaves as this can indicate nutrient burn.
11) After 4+ weeks you may see preflowers at the node sites (this is where the stems make a Y) if you see these you’re ready to go into a 12/12 light cycle. If you still don’t see them after 6 weeks 12/12 should be safe anyway.
12) One to 2 weeks into 12/12 you should see signs of gender. Females produce small white hairs while males produce balls, eliminate the males ASAP.
13) Watch your ladies grow.
14) Usually flowering can last 7 weeks or more, plan for this because the last 2 weeks you’ll be eliminating your use of nutrients and working strictly out of water.
15) You can pinpoint when you want to harvest by observing the trichomes (you’ll need a magnifier for this, at least 30x), they should be lightly cloudy, but not clear. The cloudier the more of a body high you get. Trichomes are small stems leading to little balls, they populate your buds, are extremely small, and look like lower case i’s. You don’t really need to magnify though, the plant looks “done” when it’s ready.
16) Harvest time – pick a branch, cut it off. Trim the leaves off that aren’t covered in resin. Hang the branch (or segments) on a string in a dry place until they are smokeable…but you’re not done yet. Cut everything down into small nuggets and place them into sealed glass jars and toss them in a cool dark room. Open the jar once daily, if your nuggs are excessively damp, dump them out for half a day. Toss the nuggs back in the jar, seal it for a day, leave it open for a day… do that until they’re as most or crispy as you’d like.
17) Smoke it up.
 
It sounds like you have done your homework. I recently began using a DWC system at a neutral site with a buddy and have been learning a lot. I have a couple suggestions for you...

1)Your resevoir needs to be at MINIMUM 8 inches deep but I find this to not even be enough and your roots grow down and over your air stones (not good). Mine are 12 inches deep, 12 inches across, and 16 inches front to back. The roots can grow down and cover the sir stones if your res is smaller and this will cause problems. Even with a 12 inch deep container, the rockwool cubes gets put in a pot and sits two inches below the surface, and the air stone is about an inch tall, so this only leaves 9 inches of vertical grow space for the roots. Imagine this set up in a 8 inch tall rubbermaid container....unless you want to grow small plants, you want a deeper container.
I cant fit two of these resevoirs nicely under one 400 HPS. I rotate them on a monthly schedule so I harvest once a month. The shorter one sits elevated in my grow box so the canopy is all the same height.
2) Air pumps....Here is a neat trick I use to ensure safety with the air pumps. Sometimes the pumps can die or the air stones get clogged and stop working. So What I do is run two dual outlet air pumps, with one line running to a 12" air stone in each resevoir. This way if something happens to a pump or a stone, both resevoirs will be fine until I can make the repair to the broken pump. Of course if your power goes out you are S.O.L. But if you have two resevoirs, get two dual outlet air pumps, or even if you just have one resevoir, get two single output air pumps (or more more depending on res size). Imagine watching your baby flower for 4 weeks then die cuz your air pump stops working...get two pumps
4) Dont use T-attachments and keep the tubing as short as possible, reducing the stress on the air pumps. Also if you can set your pumps higher than your res this will help ease the pressure on them.
7) I prefer Grodan brand cubes to simple rockwool. They are easier to work with IMO.
8) You are going to want bigger pots. 2-3" pots can't grow much. What I did was using the res sizes I described above I went to HomeDepot and bought a $10 3.5 inch drill bit that does fit in my batter powered $20 drill. Then I cut 9 holes in the top of each res. You will need an exacto knife or razor blade to sand down the edges. These holes will perfectly hold the size pots for the res I am describing. They are 3.75 inches across at the top and 3 inches across at the base. When you set these cups in the holes that you smoothed out the rest almost all the way down in the cut holes. This allows me to fit 18 plants under my 400HPS in two seperate res's.
11) General Hydroponics 3-Part System (look it up online)....This is what I use, it works well. However, DO NOT USE WHAT THEY RECOMEND AS THE DOSAGE STRENGTH. ALWAYS START OUT A LOT LOWER, at like 1/4 strength. You can always add more when the plants show they need it but if you burn them there is no turning back. I start out using 1/4 nutes with each batch I set into flower and then slowly increase the dosage until the plants turn from light green to a dark rich color.
14) Optional – to ease draining you may want to buy a drain valve and pvc glue to make a drainage system....you shouldn't need this. There is no drainage needed with DWC.
And if you can afford it, get a digital PH meter, the liquid stuff sucks to work with. It is time consuming and not always accurate. They can be found on ebay for like 15$.
Also, if you are going to run a VEG area and a flower area, you will need two timers.
As far as your lighting cycles are concerned, the time you leave your plant in 18/6 before flowering should only be determined by how tall you want your plants to be. I set my plants into flowering exactly 10 days after sprouting from seed or exactly 10 days from establishing roots as a clone. This limits my plant heights (combined with LST and HPS height adjustment) keeps my plants at 2-3 feet. If I was to use a 6 week veg my plants would outgrow the box I use. Just rememebr that there is no necessary amount of veg time. Whether you veg a plant for 3 months or 3 days, it will not affect quality just quantity.

And as far as checking PH goes, you are going to want to do that daily, not weekly...unless I misunderstood you.

GOOD LUCK!
Jack
 
One of the problems I started having with DWC is that while seedlings or clones are starting out in rockwool or Grodan cubes, I was having a problem. If I kept the humidity high the roots and cubes would get moldy, if I kept the humidity too low the seedlings growth would be impaired.
So to fix this problem I created a mini-DWC system for about $9 and it works PEFECTLY. My one week old seedling's tap root grew 25% overnight the first night of use, check it out!

So the first pick is the lid that I cut up from an 8 inch tuperware container. I cut 3/4" slits so that the 1 inch cubes can sit on top and the roots grow through. This particular container holds 1.75 liters, but any small size can be used. This container, one 6 inch air stone, and a can of white paint to cover the exterior and protect the roots from light was the last step. I use black electrical tape to cover the spots that I am not using clones or seedlings to prevent light entering. Check it out! It took 20 minutes to make, less than $10 in cost, it works perfectly, and I have a much better survival rate with seedlings and clones.

The black tape you see on the res in pic #3 is put on there and then painted over. Once the paint dries I remove the tape and tada!!!, I now have a water lne that I can read. I then take a new piece of electrical tape and cover over this slit until I need to check the water level again.
 

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TheSalesman

Active Member
Great guide. I'm starting my DWC over the course of the next week. All my stuff is together and ready, just need to order some seeds.

Not sure, but I've read a few places that during the seedling stage to keep the light about 6in to a foot away. When you gets stronger then lower it to two inches.

My pump isn't much higher than the container. Right now, I've got a 18 gallon rubbermaid with a dual air pump rated for 20 gallons and another airpump rated at 15 gallons. Hopefully that does the trick. I'm on a tight budget so I gotta use what I got...
 

nasd90

Well-Known Member
One of the problems I started having with DWC is that while seedlings or clones are starting out in rockwool or Grodan cubes, I was having a problem. If I kept the humidity high the roots and cubes would get moldy, if I kept the humidity too low the seedlings growth would be impaired.
So to fix this problem I created a mini-DWC system for about $9 and it works PEFECTLY. My one week old seedling's tap root grew 25% overnight the first night of use, check it out!

So the first pick is the lid that I cut up from an 8 inch tuperware container. I cut 3/4" slits so that the 1 inch cubes can sit on top and the roots grow through. This particular container holds 1.75 liters, but any small size can be used. This container, one 6 inch air stone, and a can of white paint to cover the exterior and protect the roots from light was the last step. I use black electrical tape to cover the spots that I am not using clones or seedlings to prevent light entering. Check it out! It took 20 minutes to make, less than $10 in cost, it works perfectly, and I have a much better survival rate with seedlings and clones.

The black tape you see on the res in pic #3 is put on there and then painted over. Once the paint dries I remove the tape and tada!!!, I now have a water lne that I can read. I then take a new piece of electrical tape and cover over this slit until I need to check the water level again.
GREAT guide, great pics, great going MACGYVER !!! I like it. :hump:
 

nasd90

Well-Known Member
Great guide. I'm starting my DWC over the course of the next week. All my stuff is together and ready, just need to order some seeds.

Not sure, but I've read a few places that during the seedling stage to keep the light about 6in to a foot away. When you gets stronger then lower it to two inches.

My pump isn't much higher than the container. Right now, I've got a 18 gallon rubbermaid with a dual air pump rated for 20 gallons and another airpump rated at 15 gallons. Hopefully that does the trick. I'm on a tight budget so I gotta use what I got...
The distance from light to seedling (or even full grown plant for that matter) all depends on what type of light you are using.
 
I have a dual outlet pump and i have a t connector running of both hoses so 4 air stones per pump is this not the way i should be doing it or what???
 

Bauks

Well-Known Member
18 gallon tote 4$walmart 20-60 gal air pump dual outlet 10.50$ walmart check out the two I just threw together for like 30$ I find that the plants when full grown drink up to 2 gallons of water a day so the totes can't be to small as the plants will drink the tote dry fast....check out my vids of me making them here and maybe my other DWC Vids too :)


http://www.youtube.com/watch?v=7cHQwywPBDw
 
you really did your homework huh? i will add a few things. get ecoplus airstones instead of those blue pet store ones. they will bubble more and last longer. also, get a tds/ec meter to check your reservoir. that way you'll know how much nutrient you're using. as far as lights, i wouldn't bother with mh since they're not as efficient as hps. if you must have more blue light then get a hps bulb that has more blue spectrum like a phillips son agro or hortilux super blue bulb. Fluorescents are good for seedlings and clones. i personally use a 4' t12 shop light with 2 40 watt 6500k bulbs and they work just fine for both seedlings and clones. the shop light was about $9 at home depot and the bulbs were about $7 each.
 
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