Is the water quality better in a pool with cover put back on every night, or with it left off?

crafty_gardener asked:


When using the Quick Set pool every day, does it make a difference in water quality if I put the cover back on every night or if I leave it off? Should I just save the cover for when we don’t use the pool for a few days? We do have trees nearby, though the pool is as far away as possible in our small yard and does get some debris from the trees.