{"id":6230,"date":"2026-07-09T12:14:22","date_gmt":"2026-07-09T10:14:22","guid":{"rendered":"https:\/\/trypool.com\/?p=6230"},"modified":"2026-07-29T11:08:10","modified_gmt":"2026-07-29T09:08:10","slug":"what-to-do-if-your-swimming-pool-water-is-green","status":"publish","type":"post","link":"https:\/\/trypool.com\/en\/blog\/que-hacer-si-agua-piscina-esta-verde\/","title":{"rendered":"What should I do if my swimming pool water is green?"},"content":{"rendered":"<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\"><div class=\"yoast-breadcrumbs\"><span><span><a href=\"https:\/\/trypool.com\/en\/\">Home page<\/a><\/span> \u00bb <span class=\"breadcrumb_last\" aria-current=\"page\">What should I do if my swimming pool water is green?<\/span><\/span><\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Green water in a swimming pool is one of the most common problems during the swimming season. It usually occurs when there is an imbalance in the water treatment, insufficient filtration or a build-up of algae.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although at first glance it may seem to be merely a cosmetic issue, a green swimming pool is a sign that the water is not in optimal condition. Before swimming, it is advisable to test the water, adjust its parameters and restore its clarity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For swimming pool professionals, maintenance technicians, installers and spare parts retailers, knowing how to identify the cause is key to providing a quick solution and preventing the problem from recurring.<\/p>\n\n\n\n<div style=\"height:49px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Why does the water in the swimming pool turn green?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The colour green is often associated with the presence of algae. These algae appear when the water is no longer properly disinfected, when the pH is out of balance, or when the filtration system is not working properly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The most common causes are:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Reason<\/th><th>What causes it<\/th><th>Standard solution<\/th><\/tr><\/thead><tbody><tr><td>Lack of chlorine or disinfectant<\/td><td>Algae are multiplying<\/td><td>Analysing and adjusting disinfection<\/td><\/tr><tr><td>Imbalanced pH<\/td><td>Chlorine loses its effectiveness<\/td><td>Adjust pH<\/td><\/tr><tr><td>Inadequate filtration<\/td><td>The water isn\u2019t being replaced properly<\/td><td>Check the pump, filter and filtration hours<\/td><\/tr><tr><td>Dirty filter<\/td><td>System performance is slow<\/td><td>Wash, clean or replace the filter media<\/td><\/tr><tr><td>Excess organic matter<\/td><td>Rapid chlorine consumption<\/td><td>Cleaning, brushing and deep cleaning<\/td><\/tr><tr><td>Intense heat or strong sunlight<\/td><td>Increased algal growth<\/td><td>Improve monitoring and maintenance<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.cdc.gov\/healthy-swimming\/about\/home-pool-and-hot-tub-water-treatment-and-testing.html\">CDC<\/a> It points out that chlorine and pH are the first line of defence against germs in domestic swimming pools and spas, and recommends testing and adjusting both parameters on a regular basis to keep the water safe<\/p>\n\n\n\n<div style=\"height:69px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Can you go for a swim if the pool water is green?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">It is not advisable to swim in a swimming pool with green water until the water returns to the correct parameters and clarity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Although the green colour is often caused by algae, it can also indicate insufficient disinfection or poor filtration. The CDC warns that swimming pools with correct levels of chlorine or bromine and pH are less likely to spread germs, and also recommends not swallowing water and avoiding swimming when the water is not in good condition.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a professional, the message to the client must be clear:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">First, the water is analysed and treated. Then its clarity is restored. And only when the water parameters are correct is the swimming pool ready for use again.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Step 1: Test the water before applying any products<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The first mistake you make when a swimming pool has turned green is to add chemicals without testing the water.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Before taking any action, you must check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>pH.<\/li>\n\n\n\n<li>Free chlorine or available disinfectant.<\/li>\n\n\n\n<li>Alkalinity.<\/li>\n\n\n\n<li>Stabiliser, if required.<\/li>\n\n\n\n<li>Salt level, if the pool has a salt chlorinator.<\/li>\n\n\n\n<li>Visual condition of the water.<\/li>\n\n\n\n<li>Filter pressure.<\/li>\n\n\n\n<li>How the pump works.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">On Trypool, the category of <strong><a href=\"https:\/\/trypool.com\/en\/product-category\/water-treatment\/\">Water treatment<\/a><\/strong> It includes specific products for analysis, dosing, salt chlorination and water monitoring, enabling professionals to work with a comprehensive solution, rather than just a one-off correction.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Step 2: Adjust the pH of the swimming pool<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>pH is one of the most important factors.<\/strong> If it is too high or too low, the treatment may become less effective.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The CDC recommends maintaining the pH within a range of <strong>7.0 to 7.8<\/strong>. It also states that, as the pH rises, chlorine\u2019s ability to kill germs decreases, particularly if it is above 8.0.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In both professional and domestic settings, many installations typically operate within a range close to <strong>7,2-7,6<\/strong>, but you must always follow the instructions provided by the manufacturer of the product being used and the relevant regulations in each case.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 3: Scrub the walls, floor and areas with algae<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When the water is green, the algae aren\u2019t just floating around. They\u2019re often clinging to the walls, corners, steps, lights, skimmers and the bottom.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For this reason, before or during treatment, it is advisable to brush:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Walls.<\/li>\n\n\n\n<li>Waterline.<\/li>\n\n\n\n<li>Stairs.<\/li>\n\n\n\n<li>Areas with little traffic.<\/li>\n\n\n\n<li>The bottom of the swimming pool.<\/li>\n\n\n\n<li>Around nozzles, skimmers and spotlights.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">This step helps to dislodge the algae so that the filtration system and chemical treatment can work more effectively.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Step 4: Apply an intensive treatment<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When the water turns green due to the presence of algae, it is usually necessary to carry out a shock treatment or intensive disinfection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This treatment must always be carried out:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>With the pH already adjusted.<\/li>\n\n\n\n<li>Follow the dosage recommended by the manufacturer.<\/li>\n\n\n\n<li>No swimmers in the pool.<\/li>\n\n\n\n<li>With the treatment plant in operation.<\/li>\n\n\n\n<li>Wear gloves, goggles and protective equipment if required by the product.<\/li>\n\n\n\n<li>Do not mix chemicals together.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.cdc.gov\/healthy-swimming\/about\/home-pool-and-hot-tub-water-treatment-and-testing.html\" data-type=\"link\" data-id=\"https:\/\/www.cdc.gov\/healthy-swimming\/about\/home-pool-and-hot-tub-water-treatment-and-testing.html\">CDC<\/a> It is recommended that you always read and follow the instructions on the labels, and wear protective equipment such as gloves or goggles when handling disinfectant chemicals within your water treatment category.<\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h1 class=\"wp-block-heading\">Common mistakes when treating a green swimming pool<\/h1>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\">\u2013 Add chlorine without checking the pH<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If the pH is incorrect, the treatment may not work properly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2013 Shutting down the treatment plant too early<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The treatment requires filtration to remove particles and restore clarity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2013 Do not scrub the walls and floor<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Algae that have attached themselves can survive and multiply again.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2013 Using incompatible products<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Not all products can be combined. Always follow the instructions on the label.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2013 Not checking the filter<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">If the filter is dirty, broken or the wrong size, the water may turn green again.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u2013 Thinking that the salt-based chlorinator does everything by itself<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A salt chlorinator helps to automate disinfection, but it requires maintenance, salt checks, cell cleaning, pH monitoring and proper filtration.<\/p>\n<\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1783591901576\"><strong class=\"schema-faq-question\">Why is the water in my swimming pool green?<\/strong> <p class=\"schema-faq-answer\">Swimming pool water often turns green due to the presence of algae, a lack of chlorine, an unbalanced pH, insufficient filtration or a build-up of organic matter.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783591936810\"><strong class=\"schema-faq-question\">What should I do first if the swimming pool is green?<\/strong> <p class=\"schema-faq-answer\">The first step is to test the water. You need to measure the pH, free chlorine and alkalinity, and check that the filtration system is working properly before adding any products.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783591949041\"><strong class=\"schema-faq-question\">Can I go for a swim if the pool water is green?<\/strong> <p class=\"schema-faq-answer\"><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783591972711\"><strong class=\"schema-faq-question\">Does chlorine get rid of green water?<\/strong> <p class=\"schema-faq-answer\">Chlorine can help to remove algae, but it must be applied once the pH has been adjusted and accompanied by brushing, filtration and cleaning the pool floor.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783591996980\"><strong class=\"schema-faq-question\">Why is my swimming pool still green even though I\u2019ve added chlorine?<\/strong> <p class=\"schema-faq-answer\">This may be due to high pH, bound chlorine, poor filtration, excess stabiliser, a dirty filter or high levels of organic matter.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1783592009415\"><strong class=\"schema-faq-question\">Can a swimming pool with a salt chlorinator also turn green?<\/strong> <p class=\"schema-faq-answer\">Yes. A salt-water pool can turn green if the chlorinator isn\u2019t producing enough chlorine, if there isn\u2019t enough salt, if the cell is dirty, if the pH is too high, or if the filtration system isn\u2019t working properly.<\/p> <\/div> <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Commercial CTA for Trypool<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">At Trypool, we provide professional solutions to restore and maintain swimming pool water in optimal condition: <strong>water analysis, salt chlorinators, dosing systems, pumps, filters, filter spare parts and cleaning supplies<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you\u2019re a swimming pool professional, maintenance technician, installer or specialist retailer, take a look at our range of products and choose the right solution for every installation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Browse our water treatment category and find the professional-grade product you need to keep your swimming pools clear, safe and balanced.<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>El agua verde en una piscina es uno de los problemas m\u00e1s habituales durante la temporada de ba\u00f1o. Suele aparecer cuando hay un desequilibrio en el tratamiento del agua, una filtraci\u00f3n insuficiente o una acumulaci\u00f3n de algas. Aunque a simple vista pueda parecer solo un problema est\u00e9tico, una piscina verde indica que el agua no [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6231,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"page_builder":"","footnotes":""},"categories":[1,860],"tags":[812,815,816,813,817,814,819],"class_list":["post-6230","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-limpieza-mantenimiento-piscinas","tag-agua-piscina-verde","tag-algas-en-piscina","tag-filtracion-piscina","tag-piscina-con-agua-verde","tag-tratamiento-del-agua-piscina","tag-tratamiento-piscina-verde","tag-trypool"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfQu\u00e9 hacer si el agua de mi piscina est\u00e1 verde?<\/title>\n<meta name=\"description\" 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