What are these brown spots in the gunite of my pool? Chad in Richmond has noticed brown spots on the bottom of his pool in the gunite. What causes them and how do you get rid of them. We went to our HomeShow Pro for Pools, Colt, at US Pool for help. https://media.blubrry.com/homeshow/p/homeshowradio.com/wp-content/uploads/2019/11/EE-USP-191122-Brown-Spots.mp3Podcast: Play in new windowMore HomeShow Videos:Glass Upgrade. Not your Average Pool Fence!Can I re-cycle the gunite from my old pool?How to Grow Fig TreesIs there anything I need to do to 'winterize' my pool?Salt water pool vs chlorinated pool