slowthestone

That rather bothersome conclussion really has me scratching my head.

A week into 12/12, I check the pH with me calibrated meter, and it was at 6.3, so I lowered it down to 5.8, 12 hours later...it was back at 6.3...lowered it again, being as the lights were on, I tinkered about a bit and then read the meter...6.3

The process repeated itself over another 3 days until last night, I changed the water...and added no nutes. RO btw. I put the Ph at 5.8 and went to bed.

This morning...the naked RO water's pH was...6.3

Temps are cool...between 65-70F at all times during this mystery.

Besides the tub, a hose, and a nozzle...the only anything that comes into contact with the water are the roots.

If it was static at 5.8-6.1, I'd make note and not be bothered. But on account if it being 6.3...I'm bugged.

It's plenty plausible to me wee brain that there was enough stored moisture in the roots to alter the pH of fresh RO water. Factoring in though it was doing it when there was actual solution in the tub...going no higher than 6.3, yeah... <---that's me wondering wtf.

bobbooty

prolly not the roots doing it, its the nute solution.

/edit

ok nevermind, i see you say theres no nute solution in the water.

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slowthestone

Get some coffee in ya bob!

Sauce

I assume the reason for the ph fluctuations is the naked ro itself. Water with little to nothing in has nothing to buffer ph changes. Anything that comes into contact with the water can rapidly change ph since there is nothing to buffer against it.

So I would add a little something to the water to get the ppm up to like 50-100.

What is the ppm of the water? What system are you using? What kind of medium?

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OG Refugee

slowthestone

yo sauce...

Whether it was solution, or now just plain RO water...I was seeing the same effect...the pH rising and locking in at 6.3

Same effect whether the ppm was high 800s, or the now, 21 ppm.

The set up is here... http://www.gardenscure.com/420/hydro...-system-4.html

As said...seeing this occur in plain RO doesn't surprise me. It's that it was also doing it while there was a solution present. That's why I did the water change and added nothing to it...trying to go about a process of elimination.

Sauce

Wow that is weird. I would have said then probably the medium, but you appear to have little to no medium.

I like your system, was looking through it the other day.

I am leaving soon for work but I'll look it over again and try to come up with something later tonight.

Atm I am lost with you.

Is that soil in the clear 'plant holders'? If not what's in there?

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OG Refugee

slowthestone

Ya, there be soil there sauce. It stays plenty moist, and at no time do I ever find sediment in the tank.

The nozzle though...that'd be brass. Which, because I've scene plenty of brass bits and pieces in all sorts of hydro set ups, I didn't consider it a red flag no-no till reading a bit ago....

Which made me piss myself as soon as I interpreted that bit of info to mean that hydroponic mj pH ranges corrode brass.

If I'm mistaken...I'd love it. Otherwise, I'm of the mind that the plants have been sucking on lead for a month.

ew.

Sauce

That is an interesting find. I always thought copper and brass were ok but based on that I'm not sure now.

If I were to point to one thing as the ph culprit I'd say the soil only because there doesn't seem to be anything else in your system which could cause rapid ph swings. Even if they suck up a lot of nutes the ph should still not be rising so quickly.

If the brass and copper really are corroding then that could also be the cause of the ph swings.

After reading the wikipedia brass article it seems that brass comes in many different forms which are made from a combination of different metals and elements. Depending on how the brass was made, this could affect how the brass wears and corrodes as well as how alkalinity affects it.

So in the end, I have no idea but I would think the soil or brass fitting are your suspects.

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OG Refugee

Lollie

At this point they were asking for more food and you took it all away?

This confirms they're hungry. You'd bring it down and they'd say "feed me" by bringing the pH up and you'd just say sit down and be quiet by bringing it back down. Anyway, that's what I've found in my garden...maybe your's is different?

I don't know about brass, maybe it's different...but everytime I hear about metal in the reservoirs my red flags go up?

Seems to me I remember a gardener who was collecting water run off from his copper roof (?) and it was causing strange problems? Maybe the same thing?

The main thing I'd do to turn things around is to feed them...more than they had at the beginning of this problem. That's my

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bluecheese

It's a hydro system sauce - how hard have you been hitting yourself?

My bad! Apologies Sauce.

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