I have kept liquid chlorine over the winter in my shed, if kept in the dark and close, it can be frozen and will retain its potency or only lose a little of its potency. If you let it freeze in a plastic carboy, just make sure there is enough room for expansion of the frozen container to avoid cracking it.
Shelf life and storage for various other pool chemicals: Algaecides stored in cool, dry and indoor locations will remain potent for up to five years, though direct sunlight and temperatures above 75°F (24°C) will reduce shelf life; temperatures at or below freezing (at or below 32°F or 0°C) can ruin it.
Liquids should not be stored on top of solids. Acids and chlorine should be stored apart from each other. Chemicals should be stored far away from electrical sources and heat, and areas prone to flooding.
All pool chemicals, aside from unstabilised liquid chlorine, are good for up to three to five years as long as they're stored in a cool and dark place away from sunlight and they're packed in air-tight containers. Granular chlorine can be re-packed to extend its shelf life.
The first thing to note is that it is recommended that you keep your pool chemicals at a location no warmer than 95º. The pool chemicals are reactive to sunlight so the chemicals should never be stored in direct sunlight or be near any type of heat source.
Your pool chemicals should always be stored in a cool and dry environment, to prevent them from becoming defective or dangerous. Typically, pool owners will stash their chemicals in an outdoor shed or garage.
So if you buy liquid shock, be aware that it only lasts one to two months at the most before it starts to lose effectiveness. While many swimming pool chemicals stay good for years if stored correctly, some pool-maintenance supplies expire more quickly.
Chlorinated and non-chlorinated pools freeze at the same temperature. However, salt water pools will freeze at a slightly lower temperature.
It is safe to swim once your chlorine levels are around 5 ppm or after 24 hours. It is always best to test first! Muriatic acid can create a hot spot of acid in the water that could potentially burn or irritate your skin. It is best to wait 30 minutes after adding it to your pool.
Liquid chlorine is a much better choice than tablets for shocking. It is going to go to work right away and get your chlorine levels high in a short time. Saying that, it is an expensive way to do it. Calcium Hypochlorite (cal-hypo) is a much more cost effective way.
Sodium hypochlorite (also known as liquid chlorine) is another frequently used option for shocking pool water. This is a common choice in pool shock because you can pour the solution directly into the pool without having to dissolve the chlorine in water beforehand.
Welcome to TFP. Proper testing is the only way to know for sure how much to add each day. We usually figure about 2 to 3 ppm FC loss per day. You can use the pool calc to get a ballpark of how much bleach that it's going to take each day.
Liquid Chlorine
The liquid form of chlorine is the cheapest way of adding chlorine to a pool. Simply pour it directly into the water in front of a return jet to disperse it throughout the pool.
BUT, if you have to shock your pool during the day in broad daylight, you can still swim after adding shock. It's recommended that you wait one hour after adding shock with the filter running, and then test the water to confirm the pH and chlorine are in the proper range before letting anyone enter the pool.
Chlorine issues often cause cloudy water. Adding a recommended dose of pool shock to your pool can clear it right up. Poor circulation or filtration can contribute to cloudy water. Make sure your pump and filter are working properly.
Pour the liquid chlorine into the pool with the jug as close to the water surface as possible in order to prevent splashing. Add the liquid chlorine to the deep end of the pool. After all of the liquid chlorine has been added, brush the walls and floor of the pool.
Chlorine gas appears to be yellow-green in color. Chlorine itself is not flammable, but it can react explosively or form explosive compounds with other chemicals such as turpentine and ammonia.
Chlorine is not combustible. Containers may explode when heated.
Vitamin C is a newer chemical method for neutralizing chlorine. 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.
Don't mix bleach with ammonia, acids, or other cleaners. Mixing bleach with common cleaning products can cause serious injuries. Be sure to always read the product label before using a cleaning product.
Store bleach at room temperature and not in a place where it will experience freezing or hot conditions. Usually, this means bleach should be stored indoors rather than a garage or storage shed. Be sure to store it away from access by children or pets. Keep the bleach in its original container.
Given all the factors just enumerated, the freezing point of bleach may vary. The more concentrated the bleach, the more difficult it is to freeze. But the bleach commonly used at home will start to solidify at 17⁰F as it contains 5.25% sodium hypochlorite.