Science question re: pH

H20gro said:
Right, but do u believe this process would elevate the tds ppm and thats why it was 450? Now its reading closer to 100-125. Ordered new tds pen but this one is new too!!
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test your tds pen in calibration fluid. if the pen checks ok you can trust it on the water ppm. if you are running dwc / rdwc you should invest in good brand name ph and ec pens.

a few things can affect tap water quality. most common is a break or work somewhere else in the line, not just changes at the source.
 
bluter said:
test your tds pen in calibration fluid. if the pen checks ok you can trust it on the water ppm. if you are running dwc / rdwc you should invest in good brand name ph and ec pens.

a few things can affect tap water quality. most common is a break or work somewhere else in the line, not just changes at the source.
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bluter said:
test your tds pen in calibration fluid. if the pen checks ok you can trust it on the water ppm. if you are running dwc / rdwc you should invest in good brand name ph and ec pens.

a few things can affect tap water quality. most common is a break or work somewhere else in the line, not just changes at the source.
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The calibration solution is in shipment w new pen. Just hadnt gotten around to it since i have a month old pen and doubt thats the problem. Just seems odd that tap would go from 450 to 100.

As for “investing” in a good pen, im sure u know this whole hobby is an investment and i have to be discerning in my expenditures. But i appreciate what ur saying.

Thanks for helping!
 
H20gro said:
The calibration solution is in shipment w new pen. Just hadnt gotten around to it since i have a month old pen and doubt thats the problem. Just seems odd that tap would go from 450 to 100.

As for “investing” in a good pen, im sure u know this whole hobby is an investment and i have to be discerning in my expenditures. But i appreciate what ur saying.

Thanks for helping!
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it should have read ph pen in the previous post. typically you check an ec pen against distilled water. tds / ec pens generally won't need calibration, as long as you have decent ones you are good to go.

edit : never stick a ph pen in to distilled water though. it's only to check an ec pen.
 
Peat Phreak said:
They normally use chloramine. They are temporarily switching to chlorine for a few weeks. They do this because the bacteria count in the water got too high.
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TIL..

I’m impressed with your knowledge. Are you formally educated? Your knowledge spread is wild lol
 
Keffka said:
TIL..

I’m impressed with your knowledge. Are you formally educated? Your knowledge spread is wild lol
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Yeah. His post on the chlorine is essentially same as what city’s website says in explanation of “free chlorine conversion” or whatever its called. Still wondering if itd cause a spike in tds
 
H20gro said:
Yeah. His post on the chlorine is essentially same as what city’s website says in explanation of “free chlorine conversion” or whatever its called. Still wondering if itd cause a spike in tds
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a lot of times when they make a change they'll wash the system raising your tds.

edit : depending on your source it also changes seasonally.
 
Peat Phreak said:
Thanks. Yes, I have six years of science based university education. I know about the municipal water supply chlorine conversion because I brew beer. Water science is good to know when making beer or growing weed.
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Really we should all know the science of what we put in our bodies, especially a molecule as critical as water, but that’s another topical can of worms lol.

Our tap water comes out at 75-80 ppm and I still RO it. It’s just much easier to start with a blank canvas than to try to estimate how much of what is in it. Our water reports are fairly transparent but due to all the different fluctuations I found it better just to control it myself. It leaves no room for questions about issues in the grow.
 
Peat Phreak said:
Thanks. Yes, I have six years of science based university education. I know about the municipal water supply chlorine conversion because I brew beer. Water science is good to know when making beer or growing weed.
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would be great if we could get guys like you to work on our municipal systems. the tap here is also all over the map, even depending on where you are in the city. there's still lead pipe they are removing in some places.

we mostly drink filtered here. i run all the plants on RO. houseplants get runoff.
 
Keffka said:
Our tap water comes out at 75-80 ppm and I still RO it..
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i get a dartboard of 120 - 350. i just gave up and went RO. i run a faster membrane and get 8 - 10 ppm steady. i could run the slower for 5 but there's no point. run a 1/2 dose of calmag instead of full and it's good.
 
Keffka said:
Our tap water comes out at 75-80 ppm and I still RO it
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Mine is 150ppm. I don't RO. I carbon filter it. This only removes 10ppm. It removes things like lead, cadmium, chlorine and a bunch of low level industrial chemical contaminants including weed killer.

Seems like a bad idea to feed weed killer to weed. But a lot of us do without knowing it. It's possible some of the leaf toxicities seen on the internet are partially due to low level tap water contaminants.
 
Peat Phreak said:
Mine is 150ppm. I don't RO. I carbon filter it. This only removes 10ppm. It removes things like lead, cadmium, chlorine and a bunch of low level industrial chemical contaminants including weed killer.

Seems like a bad idea to feed weed killer to weed. But a lot of us do without knowing it. It's possible some of the leaf toxicities seen on the internet are partially due to low level tap water contaminants.
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What’s interesting is when I carbon filtered my tap water it raised my PPMs. I could smell/taste the chlorine was removed but without fail it’d raise it 10-20. I figured this was related to the carbon but now I’m not sure.
 
Keffka said:
What’s interesting is when I carbon filtered my tap water it raised my PPMs. I could smell/taste the chlorine was removed but without fail it’d raise it 10-20. I figured this was related to the carbon but now I’m not sure.
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probably had to wash the filter through a few times. run a few through and the ppm should drop

it's the same on RO systems. you always wash them through when replacing a filter. that's part of why you should always replace the sediment and charcoal filters when you replace the membrane in a RO system. wash everything through at once.
 
Ok guys i have another ph question and didnt think starting a new thread was necessary.

I have two dwc 5 gallon og skywalkers. Theyre about 5 weeks from germination. One is a lil stockier and bushier than other.

They are in identical setups w one difference. Im using a larger, disc-like airstone in plant “b”. Plant a has smaller cylinder shape that ive used many times before.

Plant b ph keeps dropping while plant a is steady ph. Both ro water. Both same nutes and ppm.

I cannot understand why plant b is being a pain in my arse. Any ideas?
@Bill284 @bluter @Delps8 @Peat Phreak

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Peat Phreak said:
Different phenos of the same strain can have different metabolisms. Or plant B could be exposed to acidifying microbes and plant A is not.

You just have to adjust plant B separately.
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Yeah. I changed the airstone out and keep adding ph up. Just seems odd to me. I appreciate your reaponse!
 
what's going on with the ec and water levels on the falling ph plant ?
 
bluter said:
what's going on with the ec and water levels on the falling ph plant ?
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Good question. I will refer to the chart. Water level static. Ppm static.

I havent looked at chart but did dilute the tds so we will see.

Seems like a dumb question now that i think about it. Of course theyre gonna have different needs. Where one can handle a hotter solution. Ive been growin mg GDP clones so long i just had a brain cramp. They even look quite different.
So my plan for them to be in same rdwc is probably gonna get scrapped. May need to clone the better one and make rdwc all og skywalker clones. Hmmmm
 
H20gro said:
Interestingly enough, chart says check air source… so id already changed stones. We shall see
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i'm wondering if one was getting more delivered. you want both buckets looking like they are boiling. air and how it is delivered is kinda the key to most media types.

there's a couple threads on making your own bubblers for dwc.
 
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