All ground is going to be disturbed to install a pool level. That is bs. You don't build up the ground to install a pool. Always dig to the lowest spot so the ground is firm and compact.
Yes granted not all the uprights will be 'perfectly' level but thr bubble when plumbing them up should always be with in the lines.
As for it being with in one inch of level. This is meaning from one side to the other. Not that the upright can be with in an inch of plumb. Just that the ground 'could' have a slope of up to one inch and the pool still be with in the tolerance of being structurally safe.
Yes granted not all the uprights will be 'perfectly' level but thr bubble when plumbing them up should always be with in the lines.
As for it being with in one inch of level. This is meaning from one side to the other. Not that the upright can be with in an inch of plumb. Just that the ground 'could' have a slope of up to one inch and the pool still be with in the tolerance of being structurally safe.