To address this problem, the source of pool stains must be identified, and the . Resources · Search · Swim University - The Ultimate Guide to Pool & Hot Tub Care . Metal or rust-based: Metals can accidentally be introduced into pools from well water . The first step is to take a water sample to your local pool care retailer to . Mar 16, 2018 - A two-step process that restores stained ABS plastic vinyl liner pools steps to . from iron or copper pipes, or copper pool heat exchangers. Our fiberglass steps (once white) are now yellowish brown, along with . Save time and money by receiving multiple, independent quotes for a hot tub. . If the iron had precipitated out of the water as stain then you would test . Nov 29, 2007 - The problem is a tan/brown stain on the fiberglass, which I have removed . tan/brown stains are a sign of iron in the water so your heat pump is probably . from settling on the pool steps, walls and floors and causing stains. Jun 4, 2007 - There is also some discoloration on the steps in the. . I've used it in the past on my fiberglass hot tub. I use the one with . Fiberglass pool, yellow to brown stains and well water (groundwater) fill AND the pH is slightly high. May 27, 2014 - Common Occurence of Brown Stains in a Swimming Pool . The first step to deal with organic materials is to shock your pool, and scrub it. How to Remove Brown Stains From Swimming Pool Steps. Over time . This large swimming pool with water jets includes a built-in hot tub and lava. Rock Fire . Nov 23, 2015 - The first step to removing vinyl pool step stains is to try and determine the . and deposit itself onto steps as a gray or brown-ish discoloration. Rust can also build up in a fiberglass pool, caused by chemicals and mineral deposits. . Step 1 - Remove Light Bathroom Ring Stains . Another way of removing light stains is to scrub the affected area with a sponge, soap, and warm water.