Flushing DWC. Any point to pH the water?

[Logan Burke]

There’s no nitrogen calcium on amazon

I had seen stuff like that on amazon before but wasn't sure how legit it was, so thank you!

 

[Renfro]

What calcium nitrate?

 

[Renfro]

Do you have any recommendations for how to add calmag during flower without adding any Nitrogen? All of the calmag products I see contain nitrogen, even if it isn't that much. The lowest nitrogen supplement I've found is CaliMagic at 1% nitrogen.

Well you can always use epsom salt, magnesium sulfate, as stated by others. Usually you want calcium and magnesium in the proper ratio to avoid one locking the other out.

They contain nitrogen because of calcium nitrate being a common source of the calcium.

 

[Logan Burke]

Well you can always use epsom salt, magnesium sulfate, as stated by others. Usually you want calcium and magnesium in the proper ratio to avoid one locking the other out.

They contain nitrogen because of calcium nitrate being a common source of the calcium.

Yes I think that I'm going to stick with my Calimagic for the time being, as it does contain less N than it's counterparts. I suppose that 1-0-0 isn't very much N to worry about anyways as long as I'm not going over the label's nutrient dosage.

 

[Renfro]

Yes I think that I'm going to stick with my Calimagic for the time being, as it does contain less N than it's counterparts. I suppose that 1-0-0 isn't very much N to worry about anyways as long as I'm not going over the label's nutrient dosage.

Sometimes you can get away with running the calimagic at less than full strength depending on strain.

 

[Aqua Man]

Is there any point to adjust the pH when flushing water? If there's nothing to uptake then why bother?
I'm asking because right now my water is sitting at 7.2
Cheers.

This whole discussion is flawed. If your PH is 7.2 there is NOT nothing in your water. I take it you are using tap water? Majority of which would be calcium, magnesium, phosphates and sulfates. Also some nitrates and others like iron etc. Distilled water with 0ppm is about a PH of 6 and Its also very unstable. Flushing is a poor term to use in hydroponics since it only really applies to soil in my opinion. They are trying to rid the soil of salt buildup and excess nutrients but there is still nutrients that remain. In hydro my opinion is we should just lower our ppm as we get later into flower and keep on top of salt buildup throughout the grow with proper water changes. I think this is why most see an issue with K in flower as Na will affect K uptake.

If you are looking to get better tasting weed your efforts are better spent drying and curing properly in my opinion.

 

[1212ham]

Thought you might find this chart more enlightening...

Here's the chart for Hydro.

 

[Logan Burke]

This whole discussion is flawed. If your PH is 7.2 there is NOT nothing in your water. I take it you are using tap water? Majority of which would be calcium, magnesium, phosphates and sulfates. Also some nitrates and others like iron etc. Distilled water with 0ppm is about a PH of 6 and Its also very unstable. Flushing is a poor term to use in hydroponics since it only really applies to soil in my opinion. They are trying to rid the soil of salt buildup and excess nutrients but there is still nutrients that remain. In hydro my opinion is we should just lower our ppm as we get later into flower and keep on top of salt buildup throughout the grow with proper water changes. I think this is why most see an issue with K in flower as Na will affect K uptake.

If you are looking to get better tasting weed your efforts are better spent drying and curing properly in my opinion.

It's less about flushing and more about leaching. You want to leach the ppm's out of your roots into the clean un-nuted water via osmotic pressure. Ph doesn't matter unless you're trying to get your plant to uptake nutes rather than leach them out. In that case, PH matters. I agree though, that the need to leach nutes from a plant is fairly minimal in the absence of chronic overfeeding, the only place that there can be nute build up in hydro is inside the roots and in the hydroton/whatever your netpot's medium may be.

 

[Logan Burke]

Sometimes you can get away with running the calimagic at less than full strength depending on strain.

Yes this past grow under CMH lighting was the first time I've ever ran full strength Calimagic, I tend to stay in the 1-2mL/gallon range. It seems like the CMH lighting really increased my plant's calcium and/or magnesium uptake.