When figuring out the volume of water in a pool for adding chemicals etc., how accurate do you need to be?
For example I have a small pool being built. The overall size is 8'x32', but that includes 3 sections of the pool with a large variation in depth. The first section is 8x6.5' tanning ledge with an approximate depth of 6". The next section is roughly 8x18.5' that goes from 4'-5'. Lastly, there is the spa, 8x6 at 3.5' deep.
When determining water volume, can I just use the overall dimensions, or should I maybe figure the water volume for each of the three areas of the pool and just add them together?