Cacium Deff? Came Back from Up North and Bam

Cacium deff?? came back from up north and BAM,

Im thinking magnesium bro some epson salt or calmag would help
This sometimes pops up around week 4 for me

hellraizer30 said:

Im thinking magnesium bro some epson salt or calmag would help
This sometimes pops up around week 4 for me

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this IS day 20 flower. I actually just started trying my tap water TODAY. I was using RO and getting these spots like this on my other plants and ppl were saying to try my tap water. So in that RO I was putting Cal-Mag Plus in it. In the tap water it did not add any.

I also think it is a mag def. Before you decide to use your tap h2o (btw I hate RO water and think it is incredibly ridiculous to feed it to a plant...show me a plant that grows outdoors that gets RO water), you should find your cities water report and make sure they are adding calcium and magnesium...some municipalities have decided to forego the supplement. A quick google search result will show you every substance coming through your tap...chlorine and fluorine levels, cal and mag, bacteria...et cetera.

Tap water come out with cal and mag and all kinds of stuff thats why i use tap water and not ro, but ro
Is good for cloning. Keep using the calmag plus with tap water for a week then stop and see if the issue
Comes back

hellraizer30 said:

Tap water come out with cal and mag and all kinds of stuff thats why i use tap water and not ro, but ro
Is good for cloning. Keep using the calmag plus with tap water for a week then stop and see if the issue
Comes back

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Thats what I thought it did.

AND PEACEFARMER, i did actually do that last night and this is what I got:

(Averages in ppm)
Total Alkalinity: 32
Total Hardness: 71
Total Residue: 191
pH: 8.75
Chlorine Residual Combined: 3.8


Thats the 2009 report. 2010 not available yet i dont think

So, this has no cal-mag then right?

There were no other contaminate listed?

the report is obviously incomplete, no water in the western world comes without chlorine, or chloramine which doesn't evaporate and is very bad for your soil. pH 8.5 however is very very high, and to lower it you'll have to either use a LOT of fertilizers, or much pH down solution, both aren't good for use in every watering.

If you are using calmag+, i think it's safe to say that your problem is not a shortage of calcium or magnesium in your soil, but rather a lockout of mag, caused by either too much clacium, pH being off, or both. fix that and you'll be fine. if you still prefer to supplement cal/mag with tap water rather than with the additive, I recommend to dilute your RO with tap water, and not use it as it is. also you should find out the hardness level (which is mostly about the presence of cal/mag - this is what we call scale, the stuff that leaves residue on your kettle) in ppm. with such high pH, i bet it's pretty high too.

PeaceFarmer said:

I also think it is a mag def. Before you decide to use your tap h2o (btw I hate RO water and think it is incredibly ridiculous to feed it to a plant...show me a plant that grows outdoors that gets RO water), you should find your cities water report and make sure they are adding calcium and magnesium...some municipalities have decided to forego the supplement. A quick google search result will show you every substance coming through your tap...chlorine and fluorine levels, cal and mag, bacteria...et cetera.

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actually, most plants that grow outdoors get RO water. it's called rain. chlorine doesn't just fall from the sky.

asaph said:

actually, most plants that grow outdoors get RO water. it's called rain. chlorine doesn't just fall from the sky.

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I literally laughed when I read this. RO water is completely unnatural, removing almost every substance (including dissolved minerals) that is required for life. Rain water may have the same ppm as RO water, but rest assured it is filled with coliforms, dissolved solids, and other contaminants. It also contains quite a bit of nitrogen that it captures as it falls through the air, as well as lightning (the single largest contributer of nitrogen on the planet). My point is, RO water isnt just removing chlorine, but everything. If you let your tap water sit overnight the chlorine will dissipate and will be much better than any RO water system. Growing weed isnt rocket science, its not much different than growing any other flowering plant...would you use RO water on your cheap houseplants? I didnt think so.

It's just nutrient burn leaves curled, dark green. Too much nitrogen advanced case of 'overnitrification' calcium lockout tends to be a byproduct of this too. Flush your medium with some mild cal-mag to wash out some of the accumulated salts.

I actually just got done flushing with straight RO water ph'd to 6.5. I have this soil meter, not a digitial one, and after flushing I stuck that in both and it came back with 6.8-6.9 on both. Should i be ginving them lower ph water? I have been giving them 6.7 lately (6.5 up until lately and recently tried 6.7 cuz someone suggested) man my list is starting to accumilate in this hot weather. now my temps are running high like 90F with the dehumidifier on.... without it on my humidity would be like 70% tho.... ugh....

PeaceFarmer said:

I literally laughed when I read this. RO water is completely unnatural, removing almost every substance (including dissolved minerals) that is required for life. Rain water may have the same ppm as RO water, but rest assured it is filled with coliforms, dissolved solids, and other contaminants. It also contains quite a bit of nitrogen that it captures as it falls through the air, as well as lightning (the single largest contributer of nitrogen on the planet). My point is, RO water isnt just removing chlorine, but everything. If you let your tap water sit overnight the chlorine will dissipate and will be much better than any RO water system. Growing weed isnt rocket science, its not much different than growing any other flowering plant...would you use RO water on your cheap houseplants? I didnt think so.

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laugh all you want man. i don't grow my cheap house plants professionally, and if I would I wouldn't let them have my tap water that runs pH 7.5 and EC of 0.8, with chloramine which does not dissipate. But I don't grow them professionally, so I give just that to them. They're still alive, yes, but nowhere near the perfect health and balance my mj achieves. plus, more often than mj they get sick, infested, hungry and what not (though I cannot claim that this is just because of RO vs. tap). if you like your mj like that, go ahead and grow them in pots outside, and good luck with that.

I doubt btw that the amount of bacteria and dissolved solids rainfall has has any effect on plants. but I don't know much about that. why don't you show us some proper research that shows how rainfall feeds outdoor plants?

not to mention the fact that everything removed by RO can be easily introduced into the soil with some compost.

budtoker0987 said:

I actually just got done flushing with straight RO water ph'd to 6.5. I have this soil meter, not a digitial one, and after flushing I stuck that in both and it came back with 6.8-6.9 on both. Should i be ginving them lower ph water? I have been giving them 6.7 lately (6.5 up until lately and recently tried 6.7 cuz someone suggested) man my list is starting to accumilate in this hot weather. now my temps are running high like 90F with the dehumidifier on.... without it on my humidity would be like 70% tho.... ugh....

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those meters are worthless. get a digital pen asap.

Good thread, I've learned a lot. My plants are doing the same thing, I'm using epsom salts, but I had a lockout due to soil pH. Soil was 7.8!! D: Now flushed to 6.8, will probably have to flush again on next watering. +rep to everyone

To add to the debate, I use tap water. I was using filtered water but was told to stop using it, was this good advice?
Water in London is mostly hard, 7.7 where I live. Relatively, we don't get much chlorine in our water, but we do obviously have calcium, magnesium and recently fluoride.

Razztafarai said:

Good thread, I've learned a lot. My plants are doing the same thing, I'm using epsom salts, but I had a lockout due to soil pH. Soil was 7.8!! D: Now flushed to 6.8, will probably have to flush again on next watering. +rep to everyone

To add to the debate, I use tap water. I was using filtered water but was told to stop using it, was this good advice?
Water in London is mostly hard, 7.7 where I live. Relatively, we don't get much chlorine in our water, but we do obviously have calcium, magnesium and recently fluoride.

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depends on water quality. filtered water is better generally, imo. but if your water is not too hard (ppm < 200), then you should be fine with it. filtered water is much easier to control pH wise.

ph 8.75 ??? wtf my reef aquarium has 8.45 and thats because i add salt and i give a neverending battle to keep it that high


do u drink of this water ? definatelly use a r/o , if u drink up 2-3 litres of that water altogether , ur urine will be far more drinkable than what u drunk ... seriusly im shocked i look excactly as my avatar right now !

I think you guys are getting improper ph readings. Too much salt build up on your medium can cause ph difficulty. Nor sure what medium you're using but a high quality potting soil should buffer it self. RO water is generally a poor choice to flush, it contains no ionic charge making it difficult to flush salts from the medium. Unless your tap water is REALLY bad. If you use RO to flush add a little cal mag to it. I still put my bet on nutrient burn.

NewGrowth said:

I think you guys are getting improper ph readings. Too much salt build up on your medium can cause ph difficulty. Nor sure what medium you're using but a high quality potting soil should buffer it self. RO water is generally a poor choice to flush, it contains no ionic charge making it difficult to flush salts from the medium. Unless your tap water is REALLY bad. If you use RO to flush add a little cal mag to it. I still put my bet on nutrient burn.

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i would think having no charge would make it easier for it to leech the salts. pardon me if i'm wrong, but imo, the more saturated water is, the less soluble other elements would be in it. can you explain the logic of what you said?

all test of ph are calibrated and give aqurate readings only at 25celcius btw