Just pulled cover off.. green swamp water

[madwil]

1 gallon is close to 1 bag of shock...
1 gallon 6% adds 6ppm to 10k gallons
1 lb bag I think adds 7ppm- so slightly more, but not twice as much like the price!
PoolDoc note: This used to be true, 15 years ago. But unfortunately more recent 'flavors' of shock include widely varying 'blends' with varying levels of available chlorine. So, it is no longer a generally true statement -- it is true only in the specific case of unblended calcium hypochlorite shock with 68% available chlorine.

Also, most/all bag shocks add other things- either cya (stabilizer) or calcium; so they're ok on a temporary basis but over time will add up to problems