using CO2 to control ph

[Gen]

I just found out this incredible thing today. Using CO2 to control ph. Mountainman talked about getting a controller to build a ph adjusting machine. Someone posting about using CO2 to control ph.

Armed with my new soda club machine ($79 Edition 1) I was ready for the challenge. Today I measured tap water with CO2 and without CO2. The same with R/O water.
Seltzer water is plain water injected with CO2. Here are my results.

Tap water with CO2 5.4, 5.0, 5.0 5.1
Tap water without CO2 7.1, 7.1 7.9 8.0

R/O water with CO2 4.4, 4.4, 4.5, 4.5
R/O water without CO2 8.0, 6.0, 8.2 8.3

I injected CO2 till the machine farted. Serious folks. The machine makes a farting noise when no more CO2 can be injected into the water, but without the smell. Amazing. I used this same bottle of water all day and did not change the tap water sample or R/O sample during this experiment.

There is an errant number in R/O without CO2 which might be due to ph meter error. I did check it three different times. I used the same ph meter throughout this experiment.

CO2 stabilizes ph and brings it down and holds it steady. The hydroponics industry already knows this and is using this technology. Hence we have ph meters using CO2 to control ph.

Look at the range at both tap water and R/O water with CO2. Remarkable, the CO2 holds it steady and when compared to the same type of water without CO2 you see the increase in ph.

Look at the figures for tap and R/O water without CO2. The ph is very alkaline and the nutrients are not available at this ph level. Inject CO2 into water and look at the results. Lowered ph levels to perfect range for mj plants. ph 5.0-6.0. And so far pretty constant.

Now we know why the ph steadily rises. The plants is using up CO2. So yes the roots do take up CO2. The whole plant is a CO2 consuming factory.

So getting to the bottom line. CO2 does make a big difference. Maybe people can stop using dangerous chemicals (muriatic acid) to control ph and just use CO2 to bring ph down. I never felt good about giving my plants all that vinegar to control ph. If you poured straight vinegar on a plants root, it would die.

Gen Reviewed by Gen on 04-02-2006. using CO2 to control ph I just found out this incredible thing today. Using CO2 to control ph. Mountainman talked about getting a controller to build a ph adjusting machine. Someone posting about using CO2 to control ph. Armed with my new soda club machine ($79 Edition 1) I was ready for the challenge. Today I measured tap water with CO2 and without CO2. The same with R/O water. Seltzer water is plain water injected with CO2. Here are my results. Tap water with CO2 5.4, 5.0, 5.0 5.1 Tap water Rating: 5

[HydroDynamics]

Your idea is not revolutionary... people who have fish tanks (big ones) often use CO2 to adjust the PH. Normally they will bubble a small amount to keep it down. All it takes is on the order of 10 bubbles or so per minute through a special device that pushes the water down, while the bubbles go up (this desolvees the CO2 into the water, otherwise it would just bubble away). CO2 in water will not displace O2 But, if the O2 is kept up, like with a bubbler, so you can use both safely.

I always suggest using a bubbler to add disolved O2 to the water no matter. Roots just love it :dance:

Hope you enjoy keeping your PH adjusted with CO2 if you go that route. Personally, I go the chemical route. You can find a schematic of a PH adjuster using CO2 on the web by searching for it. If your good with a soldering iron, your almost there.

[turtle420]

Good info Gen!

Interesting read...

[Gen]

Thanks hydro, I knew people could do this because the meters are out thereto do this very thing. I think it's brilliant.

Why do you prefer chemicals? Are they just easier.

Thanks turtle.

[latewood]

I love people willing to take a chance to educate themselves
as to the pros and cons of a concept.lw

[Gen]

Thanks late. I've got an update. Hey, that rythmes.

Alright down to business, first picture is roots on CO2 and lucas formula. Before my roots hated my cooking. They would just turn brown and rot. Then I found the lucas formula and my plants started cooking. Then I added CO2 to the water and boom they are estatic. Next picture is the top of the plant. I can't tell you how many happy roots I have now.

Thanks a million guys. I am happy now.

[LIP]

"Alright down to business, first picture is roots on CO2 and lucas formula."

I see no pics?

[knowledge]

Hey Gen,

I am hoping that i could get some of your results. I was looking to build a co2 pH controller. I am wondering if it is cost effective as well.
I know if you already use co2 in the air then you should have all you need to make a co2 ph controller, along with some switches and meters. I use the Nitric acid and phoshoric acid as of now, but I to hate using corrosive chems for my roots on a constant basis.

All the info I can get would be appeciated, thanks

[Gen]

here are the pictures.

Milwaukee sells a ph CO2 meter for $80.

I have been very pleased with the results. I am only using CO2 in water and using that to adjust my ph. My ph stays closer to 6's and only once went into the 7.1 range. The roots are beautiful.

How much acid do you need to use per gallon. When I was using vinegar I had to add alot to get ph down. I had to use alot of vinegar everytime I need to adjust ph and that was twice a day. Now I just pour seltzer water in the reservoir. The lowest ph reading I got from seltzer water was in the 4 range.

The only bad part I can see is it dilutes your nutes. So I take out some water every couple of days.

[Zandor]

I used all that at one time to control my Ph as well. Now I only use Ph up and ph down from the hydro store and it's balanced better and I use way less then I ever have using Natural methods. The amount of nutrients (as long as your nutrients have buffers) you have in your res helps to keep the Ph in check as well. A 10 gal res will hold Ph better then a 5 gal res will; only because the nutrients have a buffer built in.

I have a fish Ph kit from Milwaukee and even hooked up a CO² tank to it and it worked like a charm when I was out of town. Problem is it only controls the ph one way. There is a Ph up & down as well as a feeding machine but they cost about 2k.

Even if you use lemons, vinegar or the Ph up & down the few drops you use will not dilute the nutrients. The PPM changes as the plants use up some nutrients and deposit back others.

Just a little FYI