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CLO2 Test Strips vs Photometrer 20 Jun 2021 21:40 #69587

  • dlipter
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I am just starting out working with MMS,CDS...etc.

Which brings me to the question of CLO2 measurment..

Being a numbers type of person, the Hanna Instruments HI 96738 CLO2 Photometer comes to mind.as an alternative to the more commonly used test strips.

Those of you that have experience using both test methods, could you say a few words to help me determine if the extra $$$ spent on a photometer is justified.

P.S. Is the Hanna photometer recommended, or is there another brand that is better for our needs?

Thanks,

Dennis

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Last edit: by dlipter.

CLO2 Test Strips vs Photometrer 21 Jun 2021 07:18 #69605

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Dennis, I am not familiar with Hanna CLO2 photometers. 

This is the company where I got my photometer. You would need a photometer and a set of two reagents, Part No. 486633. 

If you want to make high resolution CLO2 measurements, LaMotte test strips probably won't work. That is why I use a photometer when running various tests. If you just want to measure to see if your CDS is about 3000 ppm, then test strips are probably okay. 

 
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CLO2 Test Strips vs Photometrer 21 Jun 2021 08:27 #69608

  • JimH1954
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CLO2, what happens if smaller compartment is used as a reactor and the larger compartment is used to receive the CLO2 gas?

Just the opposite of your diagram.

Would the reaction time for 3,000 ppm CDS still be 3 hours?

TIA,

Jim in Calgary

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Last edit: by JimH1954. Reason: spelling error

CLO2 Test Strips vs Photometrer 21 Jun 2021 18:02 #69612

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Jim, the secret to making 'Quick CDS' is a reactor solution depth of 2mm or less. The deeper the reactor solution the longer the activation time and the lower the efficiency. There are other factors such as the amount of air space in the container. There are better containers than this one, but this 2 compartment bento box is easier for most people to use. Measured efficiencies between different types of containers vary from about 40% to over 70%. 

This small container produced 50ml of 3000ppm CDS in two hours at 62% efficiency. That is enough CDS for one day for most people. If used up in one day, it would not need to kept in a fridge. If you look closely, you will see a white silicone plug inserted into a hole drilled in the glass lid so CDS can be taken out of the container without losing CLO2 gas. Once CDS is made, the lid does not need to be removed. You could use a syringe and needle to take out all the CDS and transfer it to a small-mouth bottle if desired. 

The glass reactor container is supported above the CDS water by glass marbles. 

 
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CLO2 Test Strips vs Photometrer 26 Jun 2021 02:50 #69688

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This site www.wonderfullymade.us/store/p7/Water_Purification_Starter_Kit_-_CDS_Reactor.html#/ sells a 2 part Bento Box system and the video shows how to use the larger 515ml side as the receiver and the smaller 360ml side as the reactor.. The video says to put the box in the frig overnight. This system makes 400ml of CDS.

I'm thinking the larger surface area of the bigger side would allow for a more efficient CLO2 absorption into the water.

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CLO2 Test Strips vs Photometrer 26 Jun 2021 07:14 #69693

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Sergio is activating overnight. My Quick CDS method makes CDS in 2 to 5 hours depending on what ingredients are used. The key to faster activation and higher efficiency is to keep the reactor solution depth shallow and uniform, about 2 mm deep.  
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