All was well until recently when a mustardy,yellow stain started appearing on one side of the pool. Pool man brushed/cleaned it each week but it would always come back. We spoke to company who painted it & they suggested shocking the pool (no acid). Within a short time small, irregular yellowy, brown stains started covering the floor of the pool (not the steps)
Any input would be most welcome….not seeing where I can post any photos on here…
