I purchased a 3.25 lb tub of ALL oxi booster at Tom Thumb for $6.99, which is basically what I would have paid on Amazon for Oxi at 3 lbs. Only thing is Amazon won't deliver til next month, so...I'll take it.I use the Kroger branded one: "Kroger® Multi-Purpose Oxygen Cleaner"
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It appears to be mostly Sodium Percarbonate and Salt:
It's also typically inder $4 for a 3lb tub...