{"id":8153,"date":"2026-11-01T18:59:08","date_gmt":"2026-11-01T18:59:08","guid":{"rendered":"https:\/\/www.rastank.com\/resources\/uv-vs-ozone\/"},"modified":"2026-11-03T13:29:36","modified_gmt":"2026-11-03T13:29:36","slug":"uv-vs-ozone","status":"publish","type":"post","link":"https:\/\/www.rastank.com\/ar\/resources\/uv-vs-ozone\/","title":{"rendered":"UV vs ozone in RAS: which do you need?"},"content":{"rendered":"<h2>\u0645\u0639\u0642\u0645\u0627\u062a \u0627\u0644\u0623\u0634\u0639\u0629 \u0641\u0648\u0642 \u0627\u0644\u0628\u0646\u0641\u0633\u062c\u064a\u0629<\/h2>\n<p>A <a href=\"\/ar\/equipment\/uv-sterilizer\/\">\u0645\u0639\u0642\u0645 \u0628\u0627\u0644\u0623\u0634\u0639\u0629 \u0641\u0648\u0642 \u0627\u0644\u0628\u0646\u0641\u0633\u062c\u064a\u0629<\/a> passes water past UV-C lamps. The light inactivates bacteria and other pathogens without adding anything to the water. It sits on the return line, after solids removal, because particles shield pathogens from the light (<a href=\"https:\/\/link.springer.com\/article\/10.1007\/s10499-018-0301-z\">Aquaculture International<\/a>).<\/p>\n<h2>\u0645\u0648\u0644\u062f\u0627\u062a \u0627\u0644\u0623\u0648\u0632\u0648\u0646<\/h2>\n<p>An <a href=\"\/ar\/equipment\/ozone-generator\/\">ozone generator<\/a> makes ozone, a strong oxidiser. It is dosed into a side stream, usually through a protein skimmer, where it breaks down dissolved organics and colour. The ozone reacts before the water returns to the fish.<\/p>\n<h2>They work better together<\/h2>\n<p>Ozone clears colour, which lets more UV light through the water. In a USDA study, ozone raised the water\u2019s UV transmittance (<a href=\"https:\/\/www.ars.usda.gov\/research\/publications\/publication\/?seqNo115=233237\">USDA ARS<\/a>). That is why systems with high colour gain the most from ozone ahead of UV.<\/p>\n<h2>Side by side<\/h2>\n<div class=\"table-wrap\">\n<table class=\"spec\">\n<thead>\n<tr>\n<th><\/th>\n<th>\u0627\u0644\u0623\u0634\u0639\u0629 \u0641\u0648\u0642 \u0627\u0644\u0628\u0646\u0641\u0633\u062c\u064a\u0629<\/th>\n<th>\u0627\u0644\u0623\u0648\u0632\u0648\u0646<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Main job<\/td>\n<td>Inactivates pathogens<\/td>\n<td>Oxidises organics and colour<\/td>\n<\/tr>\n<tr>\n<td>Adds to water<\/td>\n<td>Nothing<\/td>\n<td>Ozone, dosed and controlled<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0645\u0648\u0642\u0639<\/td>\n<td>Return line before tanks<\/td>\n<td>Side stream, with a skimmer<\/td>\n<\/tr>\n<tr>\n<td>Needs<\/td>\n<td>Clear water, lamp replacement<\/td>\n<td>Dose control, ventilation<\/td>\n<\/tr>\n<tr>\n<td>\u0627\u0644\u0627\u0633\u062a\u062e\u062f\u0627\u0645 \u0627\u0644\u0646\u0645\u0648\u0630\u062c\u064a<\/td>\n<td>Most RAS<\/td>\n<td>Dense, marine and shrimp systems<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>Which do you need?<\/h2>\n<ul>\n<li><strong>Most farms:<\/strong> UV on the return line.<\/li>\n<li><strong>Marine and shrimp:<\/strong> UV, plus ozone with a protein skimmer.<\/li>\n<li><strong>Dense freshwater with colour build-up:<\/strong> consider adding ozone.<\/li>\n<\/ul>\n<h2>Ozone needs care<\/h2>\n<p>Ozone is harmful to fish and people at high levels. It must be dosed into a side stream, given time to react, and used in a ventilated room. We include dose control in the design.<\/p>\n<p>\u0627\u0646\u0638\u0631 <a href=\"\/ar\/equipment\/disinfection\/\">disinfection overview<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>UV and ozone are often compared as alternatives. They do different jobs. UV treats pathogens in the water flow. Ozone oxidises organics and colour. Many systems use both.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_aseo_title":"UV vs Ozone in RAS: Which Do You Need? | RASTANK","_aseo_desc":"UV and ozone do different jobs. UV treats pathogens in water flow. Ozone oxidises organics and colour. Many systems use both. Side-by-side comparison.","_aseo_noindex":false,"_aseo_og_image":8052,"_aseo_schema_type":""},"categories":[1],"tags":[],"class_list":["post-8153","post","type-post","status-publish","format-standard","hentry","category-guides"],"_links":{"self":[{"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/posts\/8153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/comments?post=8153"}],"version-history":[{"count":4,"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/posts\/8153\/revisions"}],"predecessor-version":[{"id":8524,"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/posts\/8153\/revisions\/8524"}],"wp:attachment":[{"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/media?parent=8153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/categories?post=8153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.rastank.com\/ar\/wp-json\/wp\/v2\/tags?post=8153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}