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Whats Your ph ??

G

greenmatter

hey scrogger, it was microbeman who did some tests on this, i think its the organic material in molasses. aparently a pinch of good compost will also do it because the chlorine binds to it. good if you forget to let the water stand.
i think molasses will also lower pH too. use it at 1 teaspoon per gallon, not more imo.

i just get into the habit of filling the can when i seen to my plants and let it sit for the 48 hours between that and the next time i see them - by then the chlorine should have evaporated.

as for the lime in the water, i see it as free cal/mag. as long as you see to the pH then it's a benefit imo. i use tapwater almost exclusively and my plants seem very happy.

one more thing. some water companies in the UK are starting to use Chloramine, which does not evaporate and needs treating with citric acid/molasses/ascorbic acid(vit C). if in doubt phone your water company to check.

VG

so how much citric/ascorbic acid/molasses do you use to get rid of the chloramine? how long does it take? could you expand on this?
 

VerdantGreen

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hey greenmatter, i think ascorbic acid is the 'tried and tested' way of removing chloramine, but here is a post from microbeman that talks about various methods.
personally im not sure about h202, it is a strong antimicrobial and there seems to be some disagreement on whether it works

1/ ascorbic acid for chloramines or chlorine; 3 grams in 100 gallons will
treat up to 3PPM.

2/ I found your chlorine test interesting and decided to do the same to
put my arguement that reducing sugars in the molasses would handle the
chlorine and chloramine.

Using a similar test strip that tests for both free and total
chlorine, I found my city water to have 0.5ppm free and 1.5 ppm of
free and total chlorine,respectively. Testing 1 gal and 5 gal of city
water, I added 1/4 teaspoon of molasses to each. The reaction was not
instantaneous but the kinetics were faster than I would have guessed.
The one gallon reaction showed no dectable chlorine of either type
withing 3 minutes. At 5 gallons, I obtained the same result within 20
minutes.

Chlorine levels are regulated a 4 ppm maximum
4 ppm = 4mg/l
Chloramine concentrations are expressed as chlorine equivalents, so one uses the molecular weight of chlorine for calculations.
One molecule of reducing sugar will react with one molecule of chlorine.
Therefore, on a weight basis, one needs 4mg/l *(the molecular weight of the reducing sugar/the molecular weight of chlorine)/ (the decimal fraction of reducing sugar in your molasses)
I’ve seen numbers ranging from 15% to 50% for the percent reducing sugar in molasses
The reducing sugars are going to be a mixture of mono and disaccharides. Molecular weights = 180 and 342, respectively
Chlorine molecular weight =70
Therefore, worst case, one needs 4*(342/70)/.15 =130mg/L molasses
I saw a recipe by Elaine that calls for 1 oz molasses in 5 gallons. That’s 1 part in 640 or 1563 ppm .
So, worse case you have a 12 fold excess.


Run these same numbers for pure glucose (a reducing monosaccharide) and you end up needing 10ppm glucose. When i need dilution water for spraying, I use a 20-30 ppm glucose and let it sit overnight.


I continue to be perplexed by the amount of hand wringing that
goes on over chlorine and chloramine. These both function as
oxidizing agents and, as such, are destroyed by reducing agents.

Cane molasses runs at 15-20% reducing sugar.
Regulations allow a maximum of 4ppm chlorine, expressed as Cl2.
Allowing for the molecular weight difference between Cl2 the
reducing sugars in molasses, you would need 10ppm reducing sugar to
react with the chlorine.
At 15% reducing sugar, you need 66ppm molasses.

I put my molasses in first, give it some time to react and don't
worry.
 
G

greenmatter

thanks for the info green. i knew about the h2o2 but was always stumped on what to do about chloramines. h2o2 would be a really bad mix with the microherd unless you waited for it break down, but if you have to wait anyway why use it. if you were running a clean system maybe you could do the h2o2 for the chlorine, wait 20-30 minutes and then do citric or ascorbic for the chloramines. inside an hour and you would have good water. does that sound like it would work to you? 3 grams on 100 gallons is nothing, but you might need to use some ph up to balance the brew in the end. anyone with input?
 

Scrogerman

Active member
Veteran
Oh the H2o2 works but produces Chlorates(via chlorites)/oxyanions in the oxidising process, im not sure of the implications of these chlorates even though they are oxidised. The stuff ive been reading on it is way way over my little brain!
 
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G

greenmatter

Oh the H2o2 works but produces Chlorates(via chlorites)/oxyanions in the oxidising process, im not sure of the implications of these chlorates even though they are oxidised. The stuff ive been reading on it is way way over my little brain!

:laughing: been there man. sucks when you have to click on every blue word on the wikipedia page and still don't really get what you just read
 

Scrogerman

Active member
Veteran
:laughing: been there man. sucks when you have to click on every blue word on the wikipedia page and still don't really get what you just read

LOL, but i still learn a great deal doing that kind of stuff, yeah im with ya man. i'd need a phd in chemistry to understand most of it"!
 

bigwity

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i like to let my water stand for 48 hours it makes the lime scale stick to the bottle rather than my soil.

hey V im gonna try the citric and mollasas thing, also i have a pond near me can i use that water instead of tap, i am always worried about the potential bugs in it.
 

VerdantGreen

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the other benefit of letting your water sit in the growroom or somewhere warm is that it is a better temp to water the plants. cold water straight on warm roots isnt ideal.
 
E

e4ian

dug this out:[3rd attempt of putting up!,company name was folded down on 2nd attempt! .i just dont see whats offensive.here goes.. ] . , :4.0,5.0,6.0,6.5,7.0,8.0,8.5. ..[ahaaaaaaa,middle words 'optimum'! not opium,maybe ]

physics are a bit different for nft,but i stand the water a bit for the coir
[chlorine's rife straight out the tap]. -If you grow with soil use hydrated lime. always sorts the ph out.
eee.

'thought', "why did the nips build a nuclear power plant by the sea in the first place?.did they not have 'quakes in 1971 or summat?" 'd'
'2nd thought' SHIMA, FUK'U :)
 
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JB72

Member
I used to adjust my ph using lemon juice but it was all over the place, since switching to coco I use proper ph down for coco and my plants have thanked me for it, I dont know about anyone else but I mix my nutes up first then adjust the ph as I've found coco nutes bring the ph down slightly anyway.

My ph sits anywhere between 7.4 and 7.8 which is why you should always check your ph religiously.
 

stj2006

Member
There is a great wealth of infomation in this thread now thanks for the input peoples.

Does anybody boil there water first ? Is there any benefits or downsides to doing this prior to watering. Obviously allowing to cool to room temperature.

Also is it slightly below neutral PH for growing marijuana?

I need to sort out my ph issues in time for the next round. A few of the girls are pretty beat up and I can't help but think that my ph levels and soft water have made the problems worse. They are still packing on the weight and growing so it's still good imo.

Thanks again all

St Jimi
 

VerdantGreen

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boiling water may reduce the hardness a bit but also removes all the oxygen which is not desirable. also uses a lot of energy.

good organic soil with enough compost/humus will help to buffer the soil to a large extent - but its so easy to reduce the watering pH that i think its well worth doing if your pH is over 7.5-8.

i aim for about 6 when reducing my water pH with citric acid, but im not to fussy - anywhere between 5 and 7 will do, i know the dolomite lime in the soil will help reduce any excess acidity

incidentally ive been noticing that my regular dash of citric acid solution seemed to be redeucing my pH more than usual - and i measured my tapwater today and it was 6.6!
its been solid around 8.5-9 for the last 2 years. maybe they forgot to add the lime at the water board or have changed their policy....
 

Blimey

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Boiling shouldn't make much difference w/regular tap water....you might precipitate a small amount of limescale (CaCO3 = chalk) out, but probably not enough to make a huge difference.

Yes....in soil 6.0 to 7.0 is where you want to be.

Soft water (from wiki):


Water softening methods mainly rely on the removal of Ca2+ and Mg2+ from a solution or the sequestration of these ions, i.e. binding them to a molecule that removes their ability to form scale or interfere with detergents. Removal is achieved by ion exchange and by precipitation methods. Sequestration entails the addition of chemical compounds called sequestration (or chelating) agents.

Since Ca2+ and Mg2+ exist as nonvolatile salts, they can be removed by distilling the water, but distillation is too expensive in most cases (rainwater is soft because it is, in effect, distilled).

Ion-exchange materials contain sodium ions (Na+) that are electrostatically bound and that readily are replaced by hardness ions such as Ca2+ and Mg2+. Ion exchange resins are organic polymers containing anionic functional groups to which the Na+ is bound. Minerals called zeolites also exhibits ion-exchange properties; these minerals are widely used in laundry detergents.


In English:
Naturally soft water (such as in the Lake District) has a low EC i.e. very little crap in it - because it's basically just rainwater. Water that has been artificially "softened", has had the Cal and Mag (which are OK) replaced with Sodium (which is bad).....so it depends on whether you have naturally soft or artificially soft water.

The whole point of softening water is to make it make more bubbles when you use soap or detergent.

Try using soap in the sea....it doesn't work....
 

STUPPA

Member
There is a great wealth of infomation in this thread now thanks for the input peoples.

Does anybody boil there water first ? Is there any benefits or downsides to doing this prior to watering. Obviously allowing to cool to room temperature.

Also is it slightly below neutral PH for growing marijuana?

I need to sort out my ph issues in time for the next round. A few of the girls are pretty beat up and I can't help but think that my ph levels and soft water have made the problems worse. They are still packing on the weight and growing so it's still good imo.

Thanks again all

St Jimi

No try not to boil the water it will make it even worse , it is alright to use a small amount to increase your temp a bit tho.

Also try not use the water out of the hot tap and if your cold water has not run for a while (several hours or overnight) always let the tap run for a few minutes before you collect your water.
The water in the pipes and hot tank will corrode and pick up traces of copper from the pipes over time. copper is not good for your plants!
 

stj2006

Member
Dont know if it makes any difference really but I like to use the water from the shower set too a slightly warmer setting than freezing cold. So i'm assuming it is using the cold water supply then a heating element is warming the water.

So Im going to de-chlorinate by leaving to evaporate for 48hrs, and also try to amend the ph with some form of citric acid. Can't hurt to experiment. I'm not going to worry about all this chloramite business, but it is good infomation none the less.

Okay another question, what about using water from a dehumidifier? As i understand it this water would have little mineral content very low ppm. So it would be lacking in beneficial elements.

St Jimi
 

stj2006

Member
Just realised I have been reading my test strips wrong, I am actually around 8. Just got some ph down and around 4 drops brings me somewhere between 6-7 ph. Silly me, can't remember much of gcse chemistry, or biology I'm sure if I was interested in weed back then I would have paid more attention, or maybe not come to think about it.

St Jimi
 

Blimey

Take A Deep Breath
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Glad to hear you've got that sorted. Sure you'll notice a big difference in growth.
 

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