Hi I just found this web site and in need of advice on what to do about the mold floating on the water. I have been gone and came home a month later and there is mold floating on the water. So I check the pool and add spa shock and bromide and stain remove and clartifer to see if i need to drain it and wash it out and refill with water. Do I need to do this to correct the problem or something else. Thank you for your time John