I found that United Chemicals “Cobalt Cure” worked great but was discontinued and Can’t find it anywhere. A fiberglass swimming pool is relatively easy to keep clean. Local pool stores are telling me it is etching of the gelcoat, the pool manufacturer is telling me it is calcium and that the pool needs to be drained, sanded and polished to remove the staining. Turn the pool pump off and let the water stand for 30 minutes. You won't believe this until you try it! 5. It can even be used to remove cobalt staining on fiberglass pools! Oxalic acid also helps to remove fiberglass pool stains. SAVE MONEY $$ with this method! Most pool stains occur when excess organic and/or metallic compounds and improperly balanced pool water meet. Pour 2 oz. White, brown, grey; Culprit. Making sure that the vitamin c … Well water, pipe/pipe fitting corrosion. Test the water to ensure the balances of pH and alkalinity are where they should be. Suncoast Iron & Cobalt Stain Remover. “Fiberglass is chemically inert,” says Alan Schuster, president of Aqualab Systems in Apex, N.C. “In that respect, it’s easier to maintain because it doesn’t affect the pH. Algaecides, ionizers, pipe corrosion, fittings, heaters. Sources. Will also help with discoloration from spot etching on cobalt spots on fiberglass pool surfaces. Have a good cry (I won’t judge), and then we’ll get down to business. Remove localized stains … ... Removes most stains from fibreglass pool surfaces. How to Clean an Empty Fiberglass … Culprit. Now if you need to drain the pool for some reason, you can remove the skimmer lid and visually check if there's water on the outside of the pool." The cobalt comes from osmosis of the gel coat, the giveaway sign is when there are blisters at the side of the black spot. Step 2: Take the vitamin c tablet and rub it onto the stain. Copper. "That's something we want … Make sure the pool is balanced according to Step 1. My understanding is cobalt stains should be removable with ascorbic acid (vit C). Sources. Fiberglass shells. Most fiberglass pools are coated on the inside with a clear layer that is called “gel-coat”. Black Spots in Fibreglass Pools - The Black Spots are Cobalt Oxide stains. Features & Benefits: Granular stain remover designed to remove stains from fibreglass pools; Removes black spots from fibreglass pools; Will remove most stains from fibreglass pools; Contains Metabisulphite … Always keep in … Cobalt and iron remover. Citrus Acid (a weak organic acid) used to remove stains and cobalting. Also, it doesn’t have little nooks and crannies for algae to grow.” The bad news? 2. If a color change occurs to a red … How to Remove the Stains From a Fiberglass Pool. Stain Gone. Decaying organic debris such as leaves, berries and acorns can leave behind stains on the pool … Black stains in a fiberglass pool occur when the gel coat begins to break down and is known as "cobalting". Something to break down the rubber, but you have to get it right on there, and you don’t want … Algaecides that you add to control algal outbreaks also contain metals, and tend to … Which means that the manufacturer was using an inexpensive product, when in fact they should be using an epoxy resin such as AquaGuard®, a thick film that is 100% solids reinforced epoxy based polymer designed … The good news is that stains on fiberglass pools are exceptionally easy to clean. of Suncoast Super Metal Control or muriatic acid over a small stained area. Frequent testing can help you maintain the optimal water balance. They may also be cobalt oxide stains. A. antoniosp Well-known … If a new layer of poolcoat is applied pre-maturely then the reaction underneath will continue and eventually the black stains will re-appear. Also have many industrial products that can be used to remove the stains in a backward forward... 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