Where to buy high Sodium Hypochlorite % bleach ?

I'm on a different coast with hundreds of pools in my city, the mom & pop pool store I frequent charges $5 for 1 gallon of 12.5%. Your area's stores are probably different but this gives you an idea.
 
Clorox bleach says it contains Cloromax Technology on the label. Those are polymers that are not suitbale for pools and will cause foaming. Find sources for plain bleach with no additives and check the label carefully.
 
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