If you simply do not want to use chemicals to keep your kiddie pool clean, there is an alternative. Rather than chlorine, use Distilled White Vinegar. Add 1/2 Cup for every 100 gallons of water in your pool.
Small inflatable or plastic kiddie pools and water slides don't have the same protection against germs that a swimming pool, hot tub, or water playground do. That's because it is unsafe to add germ-killing disinfectants, such as chlorine or bromine, to the water in kiddie pools and water slides.
Smaller inflatable pools, under 10 feet wide, require less chemicals, with ideal pH levels being between 7.2 to 7.8. Not every inflatable pool will need chlorine however, some people actually prefer not to use it.
For most inflatable pools or plastic kiddie pools following the guidelines listed above, the water should be changed every two weeks at a minimum. If you are not adding chlorine to kill bacteria, drain the pool every other day.
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.
Sanitizing Larger Pop-Up Pools
For larger blow-up pools without electric filters, you can still use a chlorine tablet in a locking, floating dispenser to keep the water stable as it consistently releases minimal amounts of chemical safely into the 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.
With excessive debris in the water like leaves, pine needles, and dirt, the pool walls will get slimy and grow mildew faster.
It is a good idea to wait at least 20 minutes after adding the water balancing chemicals. If you use calcium chloride in your pool, you should wait at least 2 hours to swim.
Baking Soda and Green, Blue, or Yellow Algae
You'll need to use an algaecide to kill the algae and superchlorinate your pool to clear the water. After this treatment, test your pH and alkalinity and add baking soda to raise alkalinity to at least 100 ppm and pH to between 7.2 and 7.8.
Baking Soda (Sodium Bicarbonate) is used to raise alkalinity and also slightly raise pH. And Soda Ash (Sodium Carbonate) is used to raise pH and slightly raise alkalinity. For example, getting a pH reading around 7.2 to 7.6 in 10,000 gallons (37,854 liters) of pool water would take roughly 21 pounds of baking soda.
To keep the pool clean without a filter, it is necessary to use chlorine with a flocculant or to use a flocculant chemical. This product groups the impurities that float in the water, causing them to fall to the bottom of the pool so that they can be removed later with a cleaner.
If possible, store inflatables in their original packaging; otherwise place them in individual boxes, plastic containers or zip-up storage bags. Choose storage bins or mesh bags for small toys, goggles, snorkels and water guns and noodle caddies for pool noodles.
“It's important to change the paddling pool water every day – drain it and let it dry at the end of the day and use an anti-bacterial spray to kill any germs so it is safe to use the next day.”
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.
Deciding when to change your pool water is important. Most in-ground pools should be drained and have the water replaced every five to seven years. How often you drain your pool depends on a couple of things: Maintenance and upkeep.
Leaving the pool full overnight is unsafe, both because it is a potential drowning risk and a potential waterborne disease risk.
If your kid's pool is pretty small, and draining and refilling it doesn't feel like a colossal waste of water, then the best way to keep the kiddie pool clean is to drain it when the water's dirty, scrub it down with a plain old kitchen brush and some mild dish soap, and refill it.
If you need to mildly shock a 30,000-gallon pool by raising the free chlorine concentration to 5 ppm, you need 2.5 gallons of bleach. To raise it to 10 ppm, you need 5 gallons.
High concentrations of chlorine (above 1.5 ppm) will attack the liner and bleach it, thus damaging it. Any level below this range will weaken its ability to kill off bacteria.