Carbon dioxide (co2) hyper dissolved?

[creativestartechnician]

I'm using Co2 to balance (lower) PH
I've just come across the concept of hyper dissolved o2 (HDO) to help the oxidation process. where the 02 is dissolve into a solution and then administered into the pool.
Does that concept of hyper dissolved work with co2 as well?

 

[creativestartechnician]

What's the importance or convenience of hyper dissolving the oxygen?
Would the direct input of O2 to the water have less of benefits?

 

[JoyfulNoise]

Sounds like complete snake oil nonsense. There is no such chemical principal in real science as “hyper dissolved” gases. Normal water that is considered healthy to aquatic life has a range of dissolved oxygen between 6-12 mg/L O2. Waters can be at saturation (100% saturated relative to atmospheric O2) or slight higher (120%) if there are no sources of oxygen demand and there are photosynthetic organisms producing O2 in the water. Water itself doesn’t hold oxygen for very long before it outgases to achieve equilibrium, especially in water that is moving.

If all that is proposed is to inject O2 gas into the water stream than that is nothing more than a waste of time and money as the excess will simply offgas. Since hot tubs are prone to bacterial growth more than algae, any obligate aerobes will grow with increased oxygen levels. Pseudomonas (hot tub rash) is an obligate aerobe.

 

[creativestartechnician]

What's the best way to deliver Co2 into the pool?

 

[JamesW]

The oxygen in CO₂ has no oxidation properties like ozone, oxygen gas or hydrogen peroxide.

What issues are you trying to solve?

 

[creativestartechnician]

The oxygen in CO₂ has no oxidation properties like ozone, oxygen gas or hydrogen peroxide.

What issues are you trying to solve?

View attachment 503394

adding Co2 into the water lowers the PH.

 

[mgtfp]

Just to clarify, you are not interested in the O2? That was only mentioned because of the analogy to the process that JN already snake oiled, and all you are doing is using CO2 to lower pH?

How are injecting the CO2 now? I don't think there are many options, in the end it's just an oversized soda stream.

I have never used it myself, but I imagine that it's important to inject the CO2 as fine bubbles to have a better surface-to-volume ratio of the gas bubbles to allow as much absorption into the water as possible before the bubbles reach the pool surface.

 

[JamesW]

In carbonated drinks (Beer, Champagne, soda, carbonated water etc.), the CO2 is "hyperdissolved" due to the confinement of pressure.

As soon as you release the pressure, the CO2 begins to come out.

If you agitate the drink (shaking etc.), the CO2 comes out faster.

If the drink is warm the CO2 comes out faster.

A hot tub is not pressurized, it is hot and the water is agitated, so keeping CO2 dissolved is very difficult.

Keeping the pH higher and the TA lower can help reduce the total amount of CO2 you need to use.

What is your target for pH and TA (Total Alkalinity)?

 

[creativestartechnician]

In carbonated drinks (Beer, Champagne, soda, carbonated water etc.), the CO2 is "hyperdissolved" due to the confinement of pressure.

As soon as you release the pressure, the CO2 begins to come out.

If you agitate the drink (shaking etc.), the CO2 comes out faster.

If the drink is warm the CO2 comes out faster.

A hot tub is not pressurized, it is hot and the water is agitated, so keeping CO2 dissolved is very difficult.

Keeping the pH higher and the TA lower can help reduce the total amount of CO2 you need to use.

What is your target for pH and TA (Total Alkalinity)?

TA 80, PH 7.5, CH 390,

 

[creativestartechnician]

Just to clarify, you are not interested in the O2? That was only mentioned because of the analogy to the process that JN already snake oiled, and all you are doing is using CO2 to lower pH?

How are injecting the CO2 now? I don't think there are many options, in the end it's just an oversized soda stream.

I have never used it myself, but I imagine that it's important to inject the CO2 as fine bubbles to have a better surface-to-volume ratio of the gas bubbles to allow as much absorption into the water as possible before the bubbles reach the pool surface.

I created 2 posts, one asking About the Co2 and another one asking about O2, I'm looking for answers on both topics , someone in TFP combined them and ruind my posts......

 

[JamesW]

TA 80, PH 7.5, CH 390,

If you lower the TA and increase the pH, the carbon dioxide will not come out of solution so fast.

 

[creativestartechnician]

Just to clarify, you are not interested in the O2? That was only mentioned because of the analogy to the process that JN already snake oiled, and all you are doing is using CO2 to lower pH?

How are injecting the CO2 now? I don't think there are many options, in the end it's just an oversized soda stream.

I have never used it myself, but I imagine that it's important to inject the CO2 as fine bubbles to have a better surface-to-volume ratio of the gas bubbles to allow as much absorption into the water as possible before the bubbles reach the pool surface.

I'm using Co2 right now to lower PH with great success. Right now the Co2 is feeding directly into the bottom of the water, you can see and hear the bubbles on top of the water. I've just ordered an air stone diffuser, wondering if it will save on Co2 by dispersing the Co2 better into water.......

 

[JamesW]

Contact a supplier for their recommendations on injection.

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https://eyznku599qc.exactdn.com/wp-content/uploads/2023/01/PH-50-manual.pdf

 

[creativestartechnician]

I'm using a 16" diffuser (like the one in the attached image), works great!