There are alternatives to chlorine including bromine, ionizers, and ozonators, though with each you'll still need to use some chlorine. A fourth alternative is PHMB, which doesn't require the use of any chlorine. All four have drawbacks, including cost.
SALT WATER
Salt is a very popular alternative to using chlorine, and for good reason. Saltwater pools use salt to generate chlorine, but do so in a way that does not irritate your eyes, dry out your skin or smell. Salt passes through a salt cell where it receives an electric charge, breaking it down to chlorine.
Short answer: yes. Longer answer: it depends on the formulation. The label on every bleach bottle should tell you the ratio of sodium hypochlorite (and available chlorine) in the bottle to everything else. A higher percentage is generally better, as you'll need to use less bleach to treat your pool.
It is important to know what exactly bleach is before you put it in your pool. Household bleach, Clorox and liquid chlorine can all be used to sanitize a pool. They are all types of chlorine. Household bleaches such as Clorox usually contain about 5-6% available chlorine, about half that of pool liquid chlorine.
A rule of thumb is 1.5 lbs. of baking soda per 10,000 gallons of water will raise alkalinity by about 10 ppm. If your pool's pH tested below 7.2, add 3-4 pounds of baking soda. If you're new to adding pool chemicals, start by adding only one-half or three-fourths of the recommended amount.
The benefits of swimming pool salt
Using swimming pool salt instead of chlorine delivers greater swimming comfort: Swimming pool salt does not give off an unpleasant odour as chlorine does. It is much less harsh on hair and skin. It does not cause your eyes to sting.
To mix chlorine bleach combine 5.25 percent sodium hypochlorite and 94.75 percent water. To mix non-chlorine bleach, combine equal parts hydrogen peroxide and water. Pour mixture into the plastic container, and secure tightly. Shake to mix ingredients.
Do not use Epsom salt in an ordinary, chlorinated pool. Epsom salt will quickly corrode traditional filters and can cause other pool problems that will require the intervention of a professional.
I think the answer to your question is about 3-6 days. The problem is that the chlorine that you need to keep the bacteria in check is used up more quickly as the temperature rises, the activity increases, and as sweat and other body stuff is put into the pool.
On the face of it, the idea behind adding salt to a paddling pool makes sense, since a saline environment is effective at killing some (though not all) bacteria. Salt is often presented as a healthier alternative to adding chlorine to a kiddie pool, since saltwater is gentler on the skin.
Swimming pools are a lot of fun, but maintaining one, and keeping algae at bay, can be both a chore and costly. One alternative many pool owners use to purchasing pool chemicals, is to use household chemicals such as baking soda and Clorox bleach instead.
Baking soda can work wonders in a pool. Baking soda can: Help to clear cloudy water and restore the sparkle. Spot-treat algae.
It's safe to swim immediately after adding, but you should turn on your pool's circulation system to help it dissolve.
The use of baking soda in pools can spot treat algae
It can turn any backyard pool murky green or cause unsightly black spots on the walls and floor of any swimming pool. If your algae come in the form of black spots, it can be extremely tough and frustrating to try and get off your pool's interior.
Shock. Common unscented household bleach (sodium hypochlorite) works well to shock a pool. To increase the chlorine level by 5ppm in a 10,000 gallon pool, you would need 1/2 Gallon of basic household bleach.
Borax acts as an effective pH buffer and helps prevent algae growth in swimming pools. Plus, it will leave your water looking sparkly and feeling soft.
Skimmer Net
With excessive debris in the water like leaves, pine needles, and dirt, the pool walls will get slimy and grow mildew faster.
Baking soda will raise the total alkalinity of the water. The alkalinity keeps the pH stable which then allows the bleach to remove more bacteria and contaminates. About a 1/2 of a teaspoon of baking soda will treat 26 gallons of water.
It takes a lot of chemicals to make pool water safe for swimming. Untreated water can accumulate harmful Escherichia coli and Salmonella bacteria and protozoans such as Cryptosporidium parvum and Giardia lamblia.
Maintenance is critical when it comes to the quality of your pool water. Well maintained pool water can last up to 5, maybe even seven years before you need to replace it. This means weekly cleaning, functional filters, and checking ph levels every day. Usage is a huge determining factor.
What Kind of Salt Should I Use in My Pool? It is imperative that you use only sodium chloride (NaCL) that is 99% pure. This is commonly available at most pool stores or hardware store. Do not use rock salt, salt with more than 1% yellow prussiate of soda, salt with more than 1% anti-caking additives.