Because sunlight breaks down the chlorine.
If you add it in the morning and the sun breaks it down, you may end up with little or no chlorine in your pool by late afternoon. If that happens you will have very little defense against algae all evening and night, until the next morning.
If you add your chlorine in the evening then your pool is protected all evening and night, and the sun doesn't start working on it until morning. If the chlorine is low or gone by late afternoon and you dose the pool again in the evening, there is very little time when your pool is unprotected!
The liquid chlorine formula used for swimming pool maintenance is typically sodium hypochlorite (NaClO).
If the combined chlorine in a swimming pool is a negative number, it indicates a testing error or miscalculation. It's important to retest the water using a reliable pool water testing kit to get an accurate reading. Negative combined chlorine levels are not physically possible in a swimming pool.
Chlorine typically takes about 24 to 48 hours to dissipate in a swimming pool, depending on factors such as sunlight, temperature, and water circulation.
To effectively treat and prevent chlorine burn in your swimming pool, you can maintain proper chlorine levels, regularly test and balance the water chemistry, shock the pool when needed, and ensure proper circulation and filtration. Additionally, showering before swimming and using sunscreen can help reduce the risk of chlorine burn.
To increase the chlorine level in a swimming pool, you can add chlorine tablets, liquid chlorine, or granular chlorine according to the manufacturer's instructions based on the pool's size and the current chlorine level. It's important to regularly test the water to ensure the chlorine level is within the recommended range for safe swimming.
Chlorine doesn't necessarilly work better at night. Your pool professional may tell you to add your chlorine at nite, because chlorine is emensly effected by the sun. there is achemical called "cyanuric acid", or "chlorine stabilizer". This chemical helps prevent the breakdown of the chlorine molecule in the sun's rays.
swimming pool
To disolve chlorine more gradual into the swimming pool it's better to use chlorine tables because the smaller surface of a tablet in comparison to a powder will make the tablet dissolve more slowly.
To disinfect it.
Chlorine is added to swimming pool water to disinfect it.
It is necessary because the chlorine kills all of the germs that enter the swimming pool.
If your talking about Swimming pool its because your pool has chlorine in it and chlorine kills fish :(
Answer You would be better off waiting a day or two.
chlorine
The swimming pool at the Landmark Hotel in London is 15-metres. It's a heated and chlorine-free swimming pool. One can enjoy swimming in this pool without worrying about the side effects of chlorine, especially if one is pregnant.
The liquid chlorine formula used for swimming pool maintenance is typically sodium hypochlorite (NaClO).
the higher the temp the quicker the chlorine loss