How Much Sodium Thiosulfate to Lower free Chlorine from 18 ppm to 2.0 ppm

To lower free chlorine from 18 ppm to 2.0 ppm in a 150,000-gallon pool, you would need approximately 2,100 to 4,200 ounces (60,000 to 120,000 grams) of sodium thiosulfate. This estimation accounts for reducing chlorine by approximately 16 ppm, and the actual amount needed may vary based on factors like pool conditions and the specific product used.

Chlorine Reduction Calculator

Chlorine Reduction Calculator





Initial Chlorine Level (ppm)Target Chlorine Level (ppm)Approximate Sodium Thiosulfate Needed (ounces)Approximate Sodium Thiosulfate Needed (grams)
18 ppm2.0 ppm2,100 to 4,200 ounces60,000 to 120,000 grams

FAQs

How much sodium thiosulfate to reduce chlorine? The amount of sodium thiosulfate needed to reduce chlorine depends on the chlorine concentration you want to reduce and the volume of water you are treating.

How much sodium thiosulfate do I add to my pool? The amount of sodium thiosulfate to add to a pool varies based on the pool’s size and the initial chlorine concentration. As a rough estimate, you might need approximately 1 to 2 ounces (28 to 56 grams) of sodium thiosulfate per 1,000 gallons of water to lower chlorine by 1 ppm. For a 150,000-gallon pool and to lower chlorine from 18 ppm to 2.0 ppm, you might need around 2,100 to 4,200 ounces (60,000 to 120,000 grams) of sodium thiosulfate.

Can you use too much sodium thiosulfate? Yes, using too much sodium thiosulfate can result in over-dechlorination, leading to excessively low or zero chlorine levels. It’s essential to add it cautiously and test the water to achieve the desired chlorine level.

How quickly does sodium thiosulfate work? Sodium thiosulfate typically works relatively quickly, within minutes to hours, depending on the concentration of chlorine being reduced and the mixing efficiency in the water.

What is 20% sodium thiosulfate solution? A 20% sodium thiosulfate solution means that it contains 20 grams of sodium thiosulfate dissolved in 100 milliliters of water.

How do you mix sodium thiosulfate? To mix sodium thiosulfate, you simply dissolve it in water. Stir or agitate the solution until the sodium thiosulfate is fully dissolved. The concentration of the solution depends on the amount of sodium thiosulfate you add to the water.

How long does sodium thiosulfate last in water? Sodium thiosulfate does not last indefinitely in water, and its effectiveness can decrease over time. It is best to prepare a fresh solution when needed for dechlorination purposes.

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Does sodium thiosulfate affect pH? Sodium thiosulfate is pH-neutral and generally does not significantly affect the pH of the water when used for dechlorination.

What happens when sodium thiosulfate is added to water? When sodium thiosulfate is added to water, it reacts with chlorine, converting it into chloride ions and sulfate ions. This reaction effectively dechlorinates the water.

What to do if ppm free chlorine is high? If the free chlorine level in your pool is too high, you can lower it by adding a dechlorinator like sodium thiosulfate or by diluting the pool water with fresh water.

What to add if free chlorine is high? If free chlorine is high, you can add a dechlorinator like sodium thiosulfate to reduce the chlorine level. Follow the manufacturer’s recommendations for dosage.

How do I lower the ppm free chlorine in my pool? To lower free chlorine in your pool, add a dechlorinator like sodium thiosulfate or allow the chlorine to naturally dissipate over time. Regular testing and monitoring are essential.

How long does chlorine neutralizer take to work? Chlorine neutralizer, like sodium thiosulfate, typically works within minutes to hours, depending on the chlorine concentration and the efficiency of mixing.

What is the ratio of chlorine to sulfide? The ratio of chlorine to sulfide in the reaction between chlorine and sodium thiosulfate is 1:1.

Does sodium thiosulfate remove chloramine? Sodium thiosulfate can help reduce chloramine levels, but it may not remove them entirely. To effectively remove chloramines, you may need additional treatment and filtration.

What is the most common side effect of sodium thiosulfate? The most common side effect of sodium thiosulfate is skin irritation or allergic reactions when it comes into direct contact with the skin. It’s essential to handle it with care and wear protective gear when necessary.

How long does sodium thiosulfate solution last? Sodium thiosulfate solution should be used relatively quickly after preparation, as its effectiveness can diminish over time. It’s best to make a fresh solution when needed.

Can sodium thiosulfate be given undiluted? Sodium thiosulfate should not be ingested or applied undiluted. It should always be used as directed and appropriately diluted for specific applications.

What ppm should free chlorine be? The ideal free chlorine level in a pool typically falls within the range of 1 to 3 ppm (parts per million).

What is the minimum recommended concentration of free chlorine? The minimum recommended concentration of free chlorine in a pool is usually around 1 ppm to ensure adequate sanitation.

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How do you make a Dechlorinator from sodium thiosulfate? To make a dechlorinator using sodium thiosulfate, you can dissolve a specific amount of sodium thiosulfate in water to create a solution. The exact concentration will depend on your needs and the chlorine level you want to reduce.

Can sodium thiosulphate be used to Dechlorinate water? Yes, sodium thiosulfate is commonly used to dechlorinate water by neutralizing chlorine compounds.

Why is 10% sodium thiosulfate used in preparing water samples? A 10% sodium thiosulfate solution is often used in preparing water samples for analysis to neutralize any residual chlorine, which could interfere with the accuracy of the analysis.

How do you use sodium thiosulfate? Sodium thiosulfate is used by dissolving it in water and adding the solution to the water you want to dechlorinate. The exact usage will depend on the application and the desired chlorine reduction.

What are the hazards of sodium thiosulfate? Sodium thiosulfate is generally considered safe when handled properly. However, it can cause skin and eye irritation, and ingestion should be avoided. Always follow safety precautions and guidelines when using it.

What is sodium thiosulfate 30% solution? A 30% sodium thiosulfate solution contains 30 grams of sodium thiosulfate dissolved in 100 milliliters of water.

How do you change the concentration of sodium thiosulfate? To change the concentration of sodium thiosulfate in a solution, you can dilute it by adding more water to decrease the concentration or add more sodium thiosulfate to increase it.

Can you touch sodium thiosulfate? You can touch sodium thiosulfate, but it’s advisable to wear gloves and handle it with care to avoid skin irritation or allergic reactions.

What is 0.1 M sodium thiosulfate? 0.1 M sodium thiosulfate refers to a solution that contains 0.1 moles of sodium thiosulfate per liter of solution. It is a measure of the concentration of the substance.

What is an alternative to sodium thiosulfate? An alternative to sodium thiosulfate for dechlorination is sodium metabisulfite, which can also effectively reduce chlorine levels.

Can you pour sodium thiosulfate down the sink? It is generally safe to dispose of small amounts of sodium thiosulfate down the sink with plenty of water. However, for larger quantities, follow local regulations for chemical disposal.

Will baking soda lower chlorine level in a pool? Baking soda (sodium bicarbonate) can help raise the pH of pool water but does not significantly lower chlorine levels. To reduce chlorine, a dechlorinator like sodium thiosulfate should be used.

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Does sodium thiosulfate reduce chlorine? Yes, sodium thiosulfate is commonly used to reduce or neutralize chlorine in water.

Does sodium thiosulfate degrade over time? Sodium thiosulfate can degrade over time, which is why it’s best to use freshly prepared solutions for dechlorination purposes.

What is the common name for sodium thiosulfate? The common name for sodium thiosulfate is “hypo.”

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