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Thread: Dry Ice (Solid CO2) added to pool for Halloween effects.

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    bobodaclown's Avatar
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    Dry Ice (Solid CO2) added to pool for Halloween effects.

    Hello All,
    We had a Halloween party and I used dry ice to create smoke effects in the pool. It was really cool looking. Tested my PH level today. Geeze what it low. I think it was about 7.1. Ouch.

    Live and learn!
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Richard320's Avatar
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Nothing a little aeration won't fix
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    bobodaclown if I may inquire did the dry ice have any effect on your Alkalinity?

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    bobodaclown's Avatar
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Hello,
    I checked back to my number at this link: cpsc48-install-mostly-new-reports-of-pool-conditions-t32089-40.html
    It doesn't look like it affected the alkalinity but as stated above it did drive my PH to 7.1 and came up with aeration.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Thanks very much, that is pretty much what I thought which is good news, a perfect way to drop PH without effecting Alkalinity..

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    bobodaclown's Avatar
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Found this info: http://www.anotherperfectpoolnews.com/w ... nwater.pdf

    CO2 in Pool Water #4
    CO2 can also be added to pool water by simply injecting pure CO2 into the water, or by
    adding dry ice (frozen CO2) to water. The pH will drop, and if a large amount of CO2 is
    absorbed into the water, the pH could go below 6.0. Despite the fact that the pH could be
    lowered dramatically, no change or reduction will occur in the alkalinity under this
    scenario. This fact bears repeating because it is incorrectly being taught in some
    seminars. The amount of CO2 in water does not affect the content of alkalinity, only the
    pH is affected.
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Yes I've been reading about CO2 injectors and some state that the Alkalinity rises others that it does not but on the whole it appears the majority say that it does not.

    Dry Ice is not really an option here in Europe as it is quite expensive so I'll have a look at professional CO2 automated systems. Just need to find out now if liquid chlorine has any reaction to Carbon dioxide as I use automatic chlorination and would hate to have an incident with CO2 and chlorine mixing in the pipe work.

    Thanks for the link, interesting reading indeed.

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Would this be ok to use in a HT and could you actually soak while it's floating around?

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    bobodaclown's Avatar
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    You could. Here's more info: http://www.dryiceinfo.com/safe.htm
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Quote Originally Posted by knutohotub
    Would this be ok to use in a HT and could you actually soak while it's floating around?
    Dry ice can be dangerous. It is very cold, and can cause frostbite if it contacts bare skin. As it sublimates (converts from ice to gas), it can displace oxygen leading to the risk of asphyxiation.

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Guys, you are missing the whole point. Yes, adding carbon dioxide to pool water lowers pH with no change in TA and is the exact opposite of carbon dioxide outgassing. However, if your pH is rising due to carbon dioxide outgassing, then adding carbon dioxide to the pool doesn't reduce that rate of pH rise. You are just going to yo-yo between adding carbon dioxide and having it outgas. If you were instead to add a strong acid to lower the pH and TA together, then the lower TA will reduce the rate of carbon dioxide outgassing and the rate of pH rise. That is, it solves the problem instead of masking it.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Quote Originally Posted by bobodaclown
    You could. Here's more info: http://www.dryiceinfo.com/safe.htm
    Thanks for the link.

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Quote Originally Posted by chem geek
    Guys, you are missing the whole point. Yes, adding carbon dioxide to pool water lowers pH with no change in TA and is the exact opposite of carbon dioxide outgassing. However, if your pH is rising due to carbon dioxide outgassing, then adding carbon dioxide to the pool doesn't reduce that rate of pH rise. You are just going to yo-yo between adding carbon dioxide and having it outgas. If you were instead to add a strong acid to lower the pH and TA together, then the lower TA will reduce the rate of carbon dioxide outgassing and the rate of pH rise. That is, it solves the problem instead of masking it.
    Richard I hear what you are saying, but..

    In my situation where I use a great deal of liquid chlorine which despite what anybody else says raises the PH quite a bit. I use small amounts of acid to drop the PH but as we all know the TA drops as well, any introduction of Sodium Bicarb to counter the very low TA's I get.. 15ppm or less sometimes will raise the PH right back up and in no time at all. I quite often get a situation where I have PH 7.8/7.9 and a TA of less than 20 PPM. Even with low TA's any Sodium Bicarb added even at these highish PH levels results in a moderate TA increase coupled with a PH rise which then needs reducing. I maintain 9 residential pools and all without fail all react in the same manner. I had read many places that adding sodium bicarb raises the TA and slightly raises the PH.. Well I'm afraid that this is just not true. Adding sodium bicarb with the aim of raising TA a mere 10ppm to a pool with a TA of 20 and PH 7.8 you will notice a marked increase in PH

    Now if I introduced some C02 into the water and at the same time added Sodium Bicarb then the end result should be an increase in TA alone. Now I know it will probably not work out quite how I'd like but given my current situation I'm happy to try anything to get my TA's up to at least 50/60 ppm. I'm thinking of getting a CO2 fire extinguisher and giving a go before spending too much on the idea.

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    You should see if you can get a better source of chlorinating liquid or bleach that doesn't have so much excess lye in it. Yes, there is excess lye, but high-quality chlorinating liquid, such as that from Odyssey Manufacturing, Co., only has a pH of 12.5 and 0.2-0.3% excess lye (sodium hydroxide). Clorox Regular 6% bleach has a pH of 11.9 and less than 0.06% excess lye. With the good chlorinating liquid, the pH would rise from 14 ppm FC (about one week if 2 ppm per day) from 7.5 to 7.53 if the TA were 80 ppm. If one has chlorinating liquid with a pH of 13 and 0.8% excess lye, then the pH would rise to 7.6. If one used poor bleach (as with many off-brand Ultra bleaches) with a pH of 13 then the pH would rise to 7.7.

    As for baking soda, raising the TA by 10 ppm from 70 to 80 would raise the pH from 7.5 to 7.54 IF there were no carbon dioxide outgassing, but if you add the baking soda quickly then you concentrate the TA near the surface which can have carbon dioxide outgas causing the pH to rise more. This is one situation (unlike with acid addition) where you can influence the amount of pH rise based on how you are adding the baking soda. So yes, in that situation you can use carbon dioxide to lower the pH back down since it is just replacing the carbon dioxide that outgassed.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Thanks Richard that is a good explanation of why I get such high PH rises with the addition of Sodium Bicarb. I mix my Sodium Bicarb thoroughly and pour it into the deep end of the pools so that it quickly sinks to the bottom.

    Oh and Europe is not only years behind you guys in the States in how to correctly look after a swimming pool they are also well behind you in producing quality chlorine so getting my hands on what you guys use is not an option. Hence my constant fight with high PH's as the stuff sold over here has a very high PH.

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    bobodaclown's Avatar
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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    Do you need a SWCG delivered?
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

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    Re: Dry Ice (Solid CO2) added to pool for Halloween effects.

    SWCG, same problem different cause. I think Richard posted somewhere why PH's rise so much with these, I do maintain one private pool with one fitted and have the same high PH/low TA problems.

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