Hi. Glad to be here and have already read a lot of things that help me. I have had my pool open for about a month now and the chemicals have been in balance. The other day I noticed that there was a brown spot on the bottom of my pool liner. I didn't think much about it because I thought it was just dirt. Well, then yesterday I noticed there were about 4 more brown spots on the bottom. Not algae because I keep it treated. I tried to scrub the stains but that did not work. I thought I would ask for suggestions here before I take a sample to the pool place. I've had the pool for 8 years and this is the first time I've had this problem although ever since I started having my yard fertilized, I've had other problems. Any advise will be greatly appreciated.