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Liquid swimming pool chlorine and bleach are, in effect, identical. They’re both sodium hypochlorite. This is the active ingredient for killing the algae and other organic mater in your swimming pool. Sodium hypo is great for weekly chlorination and weekly super-chlorination, if you choose to do so.
Bleach is slightly watered down at 8.25 – 8.5% sodium hypo while pool chlorine is a bit stronger at 10 – 15%. Many people have successfully used bleach for years to chlorinate their pools.
I’ve found that 1 gallon of chlorine tends to be a bit less expensive than bleach when purchased from a pool store. The cheapest I found 1 gallon of bleach is $2.94 while a gallon of chlorine is about $2.50. Not a huge difference but over the course of the swimming season the savings can add up.