I drained my pool and started refilling it using a different water source (my neighbor's hose, whith permission of course ) the pool is not quite filled 1/4 of the way and already we are have tinted green water. The liner is a checkered blue print. i have no idea what could be causing this discoloration. could it be metals even though i haven't introduced chlorine into the pool yet. i am almost positive it isn't algea. please help!