3-4% is common for the supposedly cheaper store branded bleach. 5.25% is common for name brands like Javex or Clorox, but the cost is quite a bit more. Sometimes you can find 6% Clorox.
Walmart used to carry 6% in its generic brand, like in the US, but changed that to 4% last year while leaving the price the same. All the store brands that I have checked are 3% to 4%, which doesn't end up as much of a saving.
Just to edit - this is for my location and seems to hold for Ontario in the east. It may be different in Western Canada as there can be significant differences in what is available.
That's why I have steered Canuck posters to the 12% at Canadian Tire. 5 litres sells for $4.69 vs. $8.99 at the pool store.


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