03:00  Andrea's stain assessment process08:12  Contamination of the imported pool chemicals14:50  Vitamin C iron stain test16:00  How ascorbic acid removes stains19:43  Oxalic acid for iron oxide removal22:21  Spot treat acid wash23:40  Tannin stains25:40  Citric acid 26:34  Copper-cyanurate30:43  Copper stain removalJump right in. The water's fine. Join us, Poolside!Find us onWebsite: https://talkingpools.com/Instagram: https://www.instagram.com/talkingpools/Facebook: https://www.facebook.com/TalkingPools Twitter: https://twitter.com/TalkingPoolsYouTube: Talking Pools Podcast - YouTubeOnline Pool Education Classes: https://poolclass.teachable.com/Rudy's Books:  Rudy Stankowitz - Author Support the show