FAQs
To determine your pool's chlorine levels, dip a test strip in the pool for a few seconds and then match the resulting color of the strip to a chart linked to “parts per million” chlorine levels.
What should the chlorine level be in a swim spa? ›
How much chlorine should be in a spa pool? An ideal chlorine level is 3 ppm. Chlorine levels below 2 ppm may mean your spa pool is not properly sanitised. Meanwhile, chlorine levels above 4 ppm are too high and may be harsh on your skin.
How do you read chlorine levels in a pool? ›
When using chlorine test kits, you'll need to:
- Hold a strip in your pool water for up to 10 seconds.
- Take it out and wait another 10 seconds – the strip will change colour.
- Compare the colour to the chlorine colour chart included with the strips.
- Adjust the chlorine levels as required.
The ideal chlorine level for a pool is between 1-3 parts per million (ppm.) Maintaining your swimming pool effectively means maintaining proper chlorine levels. This is essential for keeping them clean and safe for swimming.
What is an acceptable level of free chlorine for a spa pool? ›
If used properly, free chlorine* can kill most germs within a few minutes. CDC recommends pH 7.2–7.8 and a free chlorine concentration of at least 1 ppm in pools and at least 3 ppm in hot tubs/spas.
How often do I need to add chlorine to my spa? ›
It could be daily, every two to three days or weekly. For 1mg/l, add 2g per 1000 litres.
What happens if chlorine is too high in a pool? ›
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.
What chlorine level is too high? ›
However, too much chlorine can pose a health concern to any would-be swimmers. Chlorine testers can show if the chlorine levels are above the one- to three-ppm (parts per million) limit. If the levels are above three ppm, the pool water will irritate the skin and eyes, and extreme chlorination can cause poisoning.
What is the best way to measure chlorine levels? ›
The first option for testing uses a liquid chemcial OTO (othotolidine) that causes a color change to yellow in the presence of total chlorine. You simply fill a tube with water, add 1-5 drops of the solution, and look for the color change.
How long can water sit in a pool without chlorine? ›
If the water is left without chlorine or other sanitizers, bacteria and algae can start growing, which may be harmful to health. Here's a general idea: In warm temperatures and sunlight: If it's hot and the pool is exposed to sunlight, bacteria and algae can start growing within 24 to 48 hours.
Low flow = poor circulation which will lead to algae in the pool. Bottom line, the filter must be backwashed on a regular basis to ensure that your pool water is clear. "When do we need to backwash?" - It is recommended to backwash your filter once every 4-6 weeks of regular use.
Does chlorine raise or lower pH? ›
When chlorine levels are too high, the water's pH will start to decrease, which can eventually lead to corrosion. However, liquid chlorine has a pH of 13 and can cause the water's pH to increase.
Will chlorine level go down by itself? ›
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.
How do I lower the chlorine level in my pool fast? ›
Sodium thiosulfate, or sodium sulfite will reduce your chlorine levels ASAP. Simply follow the directions for dosing.
What is considered high chlorine level in hot tub? ›
If your hot tub's chlorine or bromine level is wrong (too high), it's unsafe to go in. When you go into a hot tub with chlorine or bromine levels above 3 ppm, it's normal for you to begin noticing symptoms like nausea, vomiting, itchy eyes, and difficulty breathing.
Do you put chlorine in a swim spa? ›
Before using your swim spa
Check the pH and chlorine levels, adding product as needed. Your pH should be be 7.4 – 7.6 pH and and chlorine should be 2 – 4 ppm. You should not use your swim spa if the water is cloudy or when total chlorine levels are above 5ppm.
What is too high chlorine in hot tub? ›
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.
