Too much chlorine in a hot tub can be dangerous to you, your family and your friends too, especially those who have sensitive skin and some other health conditions. An example of this would be suffering with irritation of the eyes, skin rashes, and breathing problems in some cases.
It's not safe to get in a hot tub where chlorine levels are above 3 parts per million on your test strip (or 6ppm if you use bromine). Levels above that can lead to red, itchy skin & eyes, & respiratory issues. Chlorine levels over 5ppm (or bromine levels over 10ppm) can lead to chlorine poisoning which adds th.
In most cases, it takes 24-48 hours for chlorine concentration to drop significantly. If the water is too hot or the chlorine levels are too high, it may take longer for the chlorine to evaporate. You can speed up the process using a chemical oxidizing agent or diluting the water with fresh water.
If it's extremely high, you can dilute the entire pool chlorine level with thiosulfate, which is chlorine neutralizer, but it's fairly expensive and I only recommend using it if you have to lower the chlorine level very quickly for emergency reasons, otherwise it will come down slowly on it's own over a few days.
If you are sure your tap water contains chlorine and not chloramine, you can let the water sit for 1-5 days to allow all the chlorine to evaporate. To speed up the evaporation process, aerate the water with an air stone for 12-24 hours or boil the water for 15-20 minutes.
Use a Chlorine Neutralizer
Sodium Thiosulfate is a neutralizer you can add gradually to get the chlorine level down. You'll want to follow the directions on the bottle and go by your test strip reading to determine how much to use.
The effect of excess chlorine in pools is an alteration in pH levels of pool water, making it more acidic. Signs of high chlorine levels can include itchy sensations in the eyes, nose and throat, nausea, vomiting, dizziness, lung irritation, and skin rashes.
For spas and smaller bodies of water, use 1 oz. of 3% drug store grade hydrogen peroxide per 100 gallons of spa water to lower chlorine (or bromine) levels by about 5 ppm. Remember that pH levels will drop after an effective hydrogen peroxide treatment. Be sure to rebalance your water when done.
Chlorine will burn itself off naturally. Depending on how hot it is and how high your chlorine levels are will determine the amount of time needed. It could be quick or it could take a few days.
Most of the time, you will be adding chlorine a couple times a week, or each time after you use the hot tub. Getting into this routine will insure that your hot tub is always properly maintained and ready for you whenever you are ready to jump in!
Two forms of vitamin C, ascorbic acid and sodium ascorbate, will neutralize chlorine. Neither is considered a hazardous chemical. First, vitamin C does not lower the dissolved oxygen as much as sulfur-based chemicals do. Second, vitamin C is not toxic to aquatic life at the levels used for dechlorinating water.
Sodium Ascorbate
If a large amount of treated water is going to be discharged to a small stream, the pH of the treated water and the stream should be within 0.2 to 0.5 units of the receiving stream. Approximately 2.8 parts of sodium ascorbate are required to neutralize 1 part chlorine.
If you need to quickly lower chlorine levels in your hot tub, use a chlorine neutralizer, dilute the water with fresh water, or leave the cover off and run the jets to let the chlorine dissipate. These methods can help reduce chlorine levels to the recommended range of 1-3 ppm.
High levels of chlorine can result from over shocking or adding too much sanitizer during regular hot tub maintenance. The moment you add shock to a hot tub, you're introducing high doses of chlorine or bromine into the hot tub, and it'll remain that way for quite some time unless you act.
While it's safe in small amounts, exposure to too much chlorine can cause symptoms such as trouble breathing, vomiting, and burning in your eyes and nose. If you're accidentally exposed to chlorine, wash the exposed areas of your body and get medical help right away.
In simpler terms, swimming stimulates your metabolism by increasing the circulation of blood. As a result, toxin removal is facilitated. Hence, the more you swim, the better your skin will look and feel.
Anything below 2ppm might mean that the hot tub is not sanitised to an acceptable level. You must be aware though that chlorine levels that are above 4ppm is too high and this might cause problems such as skin irritation. Dangerous levels of chlorine would be anything above 6ppm.
Likely the best chemical to use for chemical neutralization is potassium metabisulfite, which comes in the form of small tablets. Once the tablet dissolves in the water, it will effectively neutralize the chlorine before evaporating.
After acute exposure, pulmonary function usually returns toward baseline within 7 to 14 days. Although complete recovery generally occurs, symptoms and prolonged pulmonary impairment may persist. Exposure to chlorine can lead to reactive airways dysfunction syndrome (RADS), a chemical irritant-induced type of asthma.
How Long do Chlorine Tablets Last in a Hot Tub? Small 20g chlorine tablets will dissolve slowly over a period of 3-7 days depending on water flow, water temperature and hot tub usage.
Will letting water sit remove chlorine? Yes. Chlorine will dissipate over time, but after 24 hours it should be refrigerated.
Boiling water will remove chlorine, as will allowing chlorinated water to stand in an open container for a few hours.