RDWC Do I Flush Or Not? 4 weeks to go on my first RDWC grow.

neckpod

neckpod

Well-Known Member
Ok guys I Have 4 weeks to go now and coming from coco and soil grows which i always flushed the shit out of i have heard people saying not to flush in dwc?

I understand i won't have salt build up like in soil but will the bud still taste of nutrients?

surely a week or a few days of flushing with plain water is beneficial to the taste of the finished product?

Anyway you Guys have been sooo helpful with my other questions so thought id would ask what everyone does regarding flushing there dwc or rdwc systems before harvest?
 
neckpod

neckpod

Well-Known Member
FennarioMike said:
Current Culture recommends a plain water flush for the very last 2 - 3 days

http://cch2o.com/nutrient-calculators/high-yield-recirculating-hydro-nutrient-calculator/
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Thanks for this didn't think I would get a response from anyone, will take a look at the link.

I have a different issue now my recirculation pipes are blocked with roots. Should of done a diy setup with bigger piping.

Is that what you do 2 to 3 days?
Do you still adjust ph for the flush as my tap water is ph7.4.
40ppm from the tap.

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FennarioMike

FennarioMike

Well-Known Member
Yes, adjust the pH to what they are used to.

You can trim the roots back where they block the pipes with no issues as long as you don't go crazy
 
neckpod

neckpod

Well-Known Member
FennarioMike said:
Yes, adjust the pH to what they are used to.

You can trim the roots back where they block the pipes with no issues as long as you don't go crazy
Click to expand...
Its a bit late for trimming the roots now pipes are 90% blocked and i cant clear it, i have set a timer for it to flush back to my main res every couple of hours to try and keep my temps under control and water oxygenated.

Thanks again for the advice really appreciate it.
 
WeedFreak78

WeedFreak78

Well-Known Member
No, flushing is a myth, or a crutch, depending on how its used. Don't over feed and its never needed, in any medium. It's not used in ANY forms of agriculture, so why do people think it's needed here?

HYDROPONICS use leeching to remove excess nutrient from the MEDIA, noting else.
 
neckpod

neckpod

Well-Known Member
WeedFreak78 said:
No, flushing is a myth, or a crutch, depending on how its used. Don't over feed and its never needed, in any medium. It's not used in ANY forms of agriculture, so why do people think it's needed here?

HYDROPONICS use leeching to remove excess nutrient from the MEDIA, noting else.
Click to expand...
Thanks for the reply i have done a lot of reading and what you are saying does make sense.

So you would run it with nutrients right to the end? just lower them as the plants needs drop off?

Would you not drop them in the last few days?

I was going to just run ph5.8 tap water for the last few days but just don't know now?
 
WeedFreak78

WeedFreak78

Well-Known Member
neckpod said:
Thanks for the reply i have done a lot of reading and what you are saying does make sense.

So you would run it with nutrients right to the end? just lower them as the plants needs drop off?

Would you not drop them in the last few days?

I was going to just run ph5.8 tap water for the last few days but just don't know now?
Click to expand...
I run what the plant asks for, it takes some experience. Generally I increase nute strength through week 2 of flower, run a steady EC through week 6, then start cutting back start week 7. I wait for the plant to stop eating, watching for my EC to start going up and PH dropping. I usually see them stop eating as much around the start of week 7. I'll run a full nute mix around a 1.0EC starting week 7, generally just adding RO after that, tapering down to around a 0.5EC for the last week. I've been changing my res out 2-4 day's before harvest and running just a 0.2-0.3EC of base until chop. You could probably run plain water for those few day's without issue.

You'll have to figure our what EC your plants need and adjust, my numbers are what the majority of my strains like.
 
neckpod

neckpod

Well-Known Member
WeedFreak78 said:
I run what the plant asks for, it takes some experience. Generally I increase nute strength through week 2 of flower, run a steady EC through week 6, then start cutting back start week 7. I wait for the plant to stop eating, watching for my EC to start going up and PH dropping. I usually see them stop eating as much around the start of week 7. I'll run a full nute mix around a 1.0EC starting week 7, generally just adding RO after that, tapering down to around a 0.5EC for the last week. I've been changing my res out 2-4 day's before harvest and running just a 0.2-0.3EC of base until chop. You could probably run plain water for those few day's without issue.

You'll have to figure our what EC your plants need and adjust, my numbers are what the majority of my strains like.
Click to expand...

Alright pal makes sense I do have a about 15 year of growing in soil/coco on and off but never done any form of hydroponics until this Dwc grow, kinda learning all over again but your feeding through flower sounds very similar to how I used to do things in soil.

What is this ec? I have a TDS meter ppm?

I only really use this to see if my nute levels are stable or rising/falling and adjust according to plant/leaf condition at that time. Don't use ro water as we have pretty good tap water. Only 40ppm.

Here's a pic week 6.5 of flower got some leaf curl not sure what it is prob heat from the 2 x 600w. Had to turn the hps off to take pic.

Not very happy with these will be doing a more Indica dominant strain next time. Don't like the way these have stretched.

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WeedFreak78

WeedFreak78

Well-Known Member
neckpod said:
Alright pal makes sense I do have a about 15 year of growing in soil/coco on and off but never done any form of hydroponics until this Dwc grow, kinda learning all over again but your feeding through flower sounds very similar to how I used to do things in soil.

What is this ec? I have a TDS meter ppm?

I only really use this to see if my nute levels are stable or rising/falling and adjust according to plant/leaf condition at that time. Don't use ro water as we have pretty good tap water. Only 40ppm.

Here's a pic week 6.5 of flower got some leaf curl not sure what it is prob heat from the 2 x 600w. Had to turn the hps off to take pic.

Not very happy with these will be doing a more Indica dominant strain next time. Don't like the way these have stretched.

Sent from my SM-G950F using Rollitup mobile app
Click to expand...
EC is the standard measure of nutrient strength, or TDS. Ppm is a factor of EC, based off a conversion number, either .5 or .7, depending on the meter, sometimes .64, but that's kinda rare. So a 1.0 [email protected] conversion would be 500ppm, but @0.7 conversion would be a 700ppm. No matter what, its always 1.0 EC.
 
chemphlegm

chemphlegm

Well-Known Member
the directions on your bottle instruct to reduce your ppm's as your plant matures. If you follow those directions there is no flushing.
 
neckpod

neckpod

Well-Known Member
chemphlegm said:
the directions on your bottle instruct to reduce your ppm's as your plant matures. If you follow those directions there is no flushing.
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Been lowering the nutes slowly over the last week, got my ppm down from a heavy 1200ppm down to 739 my last reading 20mins ago.
This will continue to fall off like this so I expect 400ppm in about a week and half so around week 8 ish. Will obviously monitor leaf and plant condition and adjust accordingly? Well hopefully ha

Gonna stick with some more compact plants next, love my Indica dominant plants! Gotta be couch lock ha



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