Can’t fucking figure this out

cobshopgrow

cobshopgrow

Well-Known Member
guitarguy10 said:
It's because coco has a higher affinity at its cation exchange sites for Potassium and Sodium then for Magnesium and Calcium and running tap water alone through the medium will cause all of the Magnesium and Calcium that is associated with those cation exchange sites to be displaced by Potassium and Sodium.
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more the oposite.
Ca and Mg have a double positve charge and are therefore more atracted.

"If the cations of Ca, Mg, Na and K are all present in the solution at the same concentration, they will be adsorbed at different levels, with calcium and magnesium being adsorbed at double the rate as they both have a double-positive charge, while potassium and sodium have a single-positive charge (Ca++, Mg++, K+, Na+). "

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J

Jimbo the Gael

Well-Known Member
Romis said:
IMO when its just water for hydro. It's a flush.

Like Doug mentioned, there is no need to hit hydro with plain water, unless you want to flush.

To each their own.
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Yeah, it's a soil watering technique. Lots of newer growers don't know there's a difference between soil and coco. Although as I understood it most coco growers feed 1/2 strength nutes daily.
I'm not arguing, there seems to be no firm definition on what exactly a "flush" is, especially in different growing systems.
 
Doug Dawson

Doug Dawson

Well-Known Member
Jimbo the Gael said:
Yeah, it's a soil watering technique. Lots of newer growers don't know there's a difference between soil and coco. Although as I understood it most coco growers feed 1/2 strength nutes daily.
I'm not arguing, there seems to be no firm definition on what exactly a "flush" is, especially in different growing systems.
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Personally, and this is just my thought on it, flushing is just like it is with a toilet. The bowl is your medium. You push fresh fluid into that bowl forcing what`s in it down the drain leaving a bowl full of nothing but clean water. This is why I suggest mild nute solution to flush coco, so your plants are never left with just pure water. When you water in coco the new solution washes out deposits and they drain out the bottom leaving fresh nute solution in the medium. If this is done than there are no buildups and hence no need to wash out the medium because that is what the runoff did. My opinion is that if you are feeding them properly there is never a need to flush out the medium with pure water since it will always have correct levels in it due to correct feeding practices. That`s just how I understand it.
 
J

Jimbo the Gael

Well-Known Member
Doug Dawson said:
Personally, and this is just my thought on it, flushing is just like it is with a toilet. The bowl is your medium. You push fresh fluid into that bowl forcing what`s in it down the drain leaving a bowl full of nothing but clean water. This is why I suggest mild nute solution to flush coco, so your plants are never left with just pure water. When you water in coco the new solution washes out deposits and they drain out the bottom leaving fresh nute solution in the medium. If this is done than there are no buildups and hence no need to wash out the medium because that is what the runoff did. My opinion is that if you are feeding them properly there is never a need to flush out the medium with pure water since it will always have correct levels in it due to correct feeding practices. That`s just how I understand it.
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Another grower on another forum (who I usually disagree with) described giving plain water in soil like this. You're trying to get rid of a buildup of salts, but those "salts" are just nutes that are no longer in solution. Adding water "reactivates" them, so you are in effect making those nutes available to the roots again by giving plain water. I don't know if that is in any way applicable to coco, but it made sense to me.
 
Doug Dawson

Doug Dawson

Well-Known Member
Jimbo the Gael said:
Another grower on another forum (who I usually disagree with) described giving plain water in soil like this. You're trying to get rid of a buildup of salts, but those "salts" are just nutes that are no longer in solution. Adding water "reactivates" them, so you are in effect making those nutes available to the roots again by giving plain water. I don't know if that is in any way applicable to coco, but it made sense to me.
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I can see a certain logic in that. I think one big difference is the way the mediums retain nutes. Another is how you treat the medium. You can flush nutes out of coco fairly quickly but soil takes much longer to deplete. Because coco is inert it is much easer to break the bond of the nutes and push them out of the medium. If you have buildups of salts in your coco it means you have been feeding wrong. Coco should alway be moist and never dry so with feeding to runoff every day there is no salt buildup. Soil on the other hand is to be left to dry out which would cause those buildups. This is why, at least in my mind, you should only flush your coco if you have been feeding it wrong. As I say, that`s just the way I understand it to work.
 
J

Jimbo the Gael

Well-Known Member
Doug Dawson said:
I can see a certain logic in that. I think one big difference is the way the mediums retain nutes. Another is how you treat the medium. You can flush nutes out of coco fairly quickly but soil takes much longer to deplete. Because coco is inert it is much easer to break the bond of the nutes and push them out of the medium. If you have buildups of salts in your coco it means you have been feeding wrong. Coco should alway be moist and never dry so with feeding to runoff every day there is no salt buildup. Soil on the other hand is to be left to dry out which would cause those buildups. This is why, at least in my mind, you should only flush your coco if you have been feeding it wrong. As I say, that`s just the way I understand it to work.
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Makes perfect sense.
 
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