later.
your pool should loose no more than ¼ inch per day. otherwise, a leak is indicated.
place a 5 gallon bucket filled with pool water on a pool step (the level in the bucket should be even with the pool level).
mark the level of the water in the bucket and on the side of the pool.
after 24 hours if there is a greater drop in the pool level than in the bucket, a leak in the pool is indicated.
if the water level settles at the light, the leak is probably there.
if the water drops below the light, then there may be a leak in the drain at the bottom of the 