I go to Wal-Mart and the pool bleach is sometimes cheaper than the laundry bleach and both have the same contents except the pool bleach is a little higher percentage. Like 11% and 8% or something like that. I remember a long time ago trying to figure this out and I came up with 1/3 cup of household bleach = one tablespoon of dichlor. Laundry soap we use the cup is 1/3 cup so I saved a bunch of them for bleach measures.
Be careful not to get bleach with smells added and really don’t use the safety bleach that has thickener in it. It will cause all kinds of foam.
Last year we went to buy laundry bleach and it couldn’t be found in the city. I went to the pool area and they had 100s of gallons. As I was looking at it some guy and his wife come up with two carts and load as much as they could haul away. Telling me better get it now its going fast. So I bought two.
The best way going IMO is to buy a Saltron mini and stick it on the side of your tub and never buy chlorine again.