{"id":10088,"date":"2026-03-19T16:39:11","date_gmt":"2026-03-19T14:39:11","guid":{"rendered":"https:\/\/vestelli-fi.kehityspalvelin.fi\/tuote\/closed-tank-extra-low-iisi-5000-package\/"},"modified":"2026-07-08T16:07:55","modified_gmt":"2026-07-08T13:07:55","slug":"closed-tank-extra-low-iisi-5000-package","status":"publish","type":"product","link":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/","title":{"rendered":"Closed tank extra low IISI 5000 package"},"content":{"rendered":"<p><a href=\"https:\/\/avalon-nordic.kansleri.fi\/wp-content\/uploads\/2023\/02\/IISI-Erikoismatala-umpisailio-5000_ominaisuudet.png\"><img decoding=\"async\" class=\"alignnone wp-image-7293 size-full\" src=\"https:\/\/avalon-nordic.kansleri.fi\/wp-content\/uploads\/2023\/02\/IISI-Erikoismatala-umpisailio-5000_ominaisuudet.png\" alt=\"\" width=\"1981\" height=\"1263\"><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p><span style=\"color: #333333;\"><strong>Price from \u20ac<\/strong><\/span><\/p>\n<p><span style=\"color: #333333;\"><strong>The height from the bottom of the tank to the drain outlet is only 95 cm.<\/strong><\/span><\/p>\n<p><span style=\"color: #333333;\">Extra-low IISI \u2013 Closed tank for wastewater collection. The extra-low structure makes installation significantly easier, as its excavation is about half as deep as a conventional tank. The bottom of the tank is significantly closer to the ground surface and is not as easily exposed to the buoyancy stress caused by runoff and groundwater. The tank is designed specifically for demanding ground installation and is very durable.   <\/span><\/p>\n<p><span style=\"color: #333333;\">The properties of the ultra-low IISI \u2013 Closed Tank are in a class of their own and their strength properties are still 100% present, even when the durability limits of a conventional closed tank have already been reached.<\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\">200%* <sup>)<\/sup> higher permissible groundwater level in the soil<\/span><\/li>\n<li><span style=\"color: #333333;\">50%* <sup>)<\/sup> lower installation trench requirement below the inlet drain<\/span><\/li>\n<li><span style=\"color: #333333;\">25%* <sup>)<\/sup> higher permitted soil filling on top of the tank<\/span><\/li>\n<li><span style=\"color: #333333;\">permitted groundwater level below the sewer inlet connection<\/span><\/li>\n<li><span style=\"color: #333333;\">large service pipes 450 and 800 mm<\/span><\/li>\n<li><span style=\"color: #333333;\">Versatile input connection options and series connection option<\/span><\/li>\n<li><span style=\"color: #333333;\">ultra-low and strength-optimized design<\/span><\/li>\n<li><span style=\"color: #333333;\">made from the best raw materials without sparing them<\/span><\/li>\n<li><span style=\"color: #333333;\">tested extensively according to the methods of the EN12566 standard<\/span><\/li>\n<li><span style=\"color: #333333;\">environmentally friendly 100% recyclable raw material is also food grade<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #333333;\"><em>*) compared to standard 5000-5500 liter closed tanks on the market<\/em><\/span><\/p>\n<p><span style=\"color: #333333;\">You can recognize a good and durable closed container by<\/span><\/p>\n<ul>\n<li><span style=\"color: #333333;\">the lower the overall structure of the closed tank, the better<\/span><\/li>\n<li><span style=\"color: #333333;\">The closer the permitted groundwater level is to the sewer pipe connection, the better.<\/span><\/li>\n<li><span style=\"color: #333333;\">the more fill soil allowed on top of the tank, the better<\/span><\/li>\n<li><span style=\"color: #333333;\">the bigger the service pipe, the better<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #333333;\">In comparisons and tests, all the requirements and properties of the extra-low IISI Closed Tank are met, which shows that the IISI closed tank is correctly designed to withstand various stress factors, the best available raw materials are used in its manufacture without sparing it, and its installation is easier even in demanding conditions.<\/span><\/p>\n<p><span style=\"color: #333333;\">The IISI 5000L closed tank can be connected in series to achieve a larger volume.<\/span><\/p>\n","protected":false},"featured_media":10089,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[137],"product_tag":[],"class_list":["post-10088","product","type-product","status-publish","has-post-thumbnail","product_cat-septic-tanks","first","instock","shipping-taxable","purchasable","product-type-simple"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Closed tank extra low IISI 5000 package | Vestelli.fi<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Closed tank extra low IISI 5000 package | Vestelli.fi\" \/>\n<meta property=\"og:description\" content=\"Price from \u20ac The height from the bottom of the tank to the drain outlet is only 95 cm. Extra-low IISI \u2013 Closed tank for wastewater collection. The extra-low structure makes installation significantly easier, as its excavation is about half as deep as a conventional tank. The bottom of the tank is significantly closer to the ground surface and is not as easily exposed to the buoyancy stress caused by runoff and groundwater. The tank is designed specifically for demanding ground installation and is very durable.  The properties of the ultra-low IISI \u2013 Closed Tank are in a class of their own and their strength properties are still 100% present, even when the durability limits of a conventional closed tank have already been reached. 200%* ) higher permissible groundwater level in the soil 50%* ) lower installation trench requirement below the inlet drain 25%* ) higher permitted soil filling on top of the tank permitted groundwater level below the sewer inlet connection large service pipes 450 and 800 mm Versatile input connection options and series connection option ultra-low and strength-optimized design made from the best raw materials without sparing them tested extensively according to the methods of the EN12566 standard environmentally friendly 100% recyclable raw material is also food grade *) compared to standard 5000-5500 liter closed tanks on the market You can recognize a good and durable closed container by the lower the overall structure of the closed tank, the better The closer the permitted groundwater level is to the sewer pipe connection, the better. the more fill soil allowed on top of the tank, the better the bigger the service pipe, the better In comparisons and tests, all the requirements and properties of the extra-low IISI Closed Tank are met, which shows that the IISI closed tank is correctly designed to withstand various stress factors, the best available raw materials are used in its manufacture without sparing it, and its installation is easier even in demanding conditions. The IISI 5000L closed tank can be connected in series to achieve a larger volume.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/\" \/>\n<meta property=\"og:site_name\" content=\"Vestelli.fi\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-08T13:07:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2026\/03\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1400\" \/>\n\t<meta property=\"og:image:height\" content=\"1400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/\",\"url\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/\",\"name\":\"Closed tank extra low IISI 5000 package | Vestelli.fi\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg\",\"datePublished\":\"2026-03-19T14:39:11+00:00\",\"dateModified\":\"2026-07-08T13:07:55+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/#primaryimage\",\"url\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg\",\"contentUrl\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg\",\"width\":1400,\"height\":1400},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/tuote\\\/closed-tank-extra-low-iisi-5000-package\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Closed tank extra low IISI 5000 package\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/\",\"name\":\"Vestelli.fi\",\"description\":\"Puhtaiden vesien puolesta \u2013 tehokkaat j\u00e4tevesij\u00e4rjestelm\u00e4t\",\"publisher\":{\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/#organization\",\"name\":\"Vestelli Oy\",\"url\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/wp-content\\\/uploads\\\/2018\\\/05\\\/vestelli_logo-e1577697076704.png\",\"contentUrl\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/wp-content\\\/uploads\\\/2018\\\/05\\\/vestelli_logo-e1577697076704.png\",\"width\":200,\"height\":72,\"caption\":\"Vestelli Oy\"},\"image\":{\"@id\":\"https:\\\/\\\/vestelli-fi.kehityspalvelin.fi\\\/en\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Closed tank extra low IISI 5000 package | Vestelli.fi","robots":{"index":"noindex","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"og_locale":"en_US","og_type":"article","og_title":"Closed tank extra low IISI 5000 package | Vestelli.fi","og_description":"Price from \u20ac The height from the bottom of the tank to the drain outlet is only 95 cm. Extra-low IISI \u2013 Closed tank for wastewater collection. The extra-low structure makes installation significantly easier, as its excavation is about half as deep as a conventional tank. The bottom of the tank is significantly closer to the ground surface and is not as easily exposed to the buoyancy stress caused by runoff and groundwater. The tank is designed specifically for demanding ground installation and is very durable.  The properties of the ultra-low IISI \u2013 Closed Tank are in a class of their own and their strength properties are still 100% present, even when the durability limits of a conventional closed tank have already been reached. 200%* ) higher permissible groundwater level in the soil 50%* ) lower installation trench requirement below the inlet drain 25%* ) higher permitted soil filling on top of the tank permitted groundwater level below the sewer inlet connection large service pipes 450 and 800 mm Versatile input connection options and series connection option ultra-low and strength-optimized design made from the best raw materials without sparing them tested extensively according to the methods of the EN12566 standard environmentally friendly 100% recyclable raw material is also food grade *) compared to standard 5000-5500 liter closed tanks on the market You can recognize a good and durable closed container by the lower the overall structure of the closed tank, the better The closer the permitted groundwater level is to the sewer pipe connection, the better. the more fill soil allowed on top of the tank, the better the bigger the service pipe, the better In comparisons and tests, all the requirements and properties of the extra-low IISI Closed Tank are met, which shows that the IISI closed tank is correctly designed to withstand various stress factors, the best available raw materials are used in its manufacture without sparing it, and its installation is easier even in demanding conditions. The IISI 5000L closed tank can be connected in series to achieve a larger volume.","og_url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/","og_site_name":"Vestelli.fi","article_modified_time":"2026-07-08T13:07:55+00:00","og_image":[{"width":1400,"height":1400,"url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2026\/03\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/","url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/","name":"Closed tank extra low IISI 5000 package | Vestelli.fi","isPartOf":{"@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/#website"},"primaryImageOfPage":{"@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/#primaryimage"},"image":{"@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/#primaryimage"},"thumbnailUrl":"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2026\/03\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg","datePublished":"2026-03-19T14:39:11+00:00","dateModified":"2026-07-08T13:07:55+00:00","breadcrumb":{"@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/#primaryimage","url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2026\/03\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg","contentUrl":"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2026\/03\/Toimituspaketti-Umpisailio-IISI-erikoismatala-5000L-450.jpg","width":1400,"height":1400},{"@type":"BreadcrumbList","@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/tuote\/closed-tank-extra-low-iisi-5000-package\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/"},{"@type":"ListItem","position":2,"name":"Shop","item":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/shop\/"},{"@type":"ListItem","position":3,"name":"Closed tank extra low IISI 5000 package"}]},{"@type":"WebSite","@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/#website","url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/","name":"Vestelli.fi","description":"Puhtaiden vesien puolesta \u2013 tehokkaat j\u00e4tevesij\u00e4rjestelm\u00e4t","publisher":{"@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/#organization","name":"Vestelli Oy","url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/#\/schema\/logo\/image\/","url":"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2018\/05\/vestelli_logo-e1577697076704.png","contentUrl":"https:\/\/vestelli-fi.kehityspalvelin.fi\/wp-content\/uploads\/2018\/05\/vestelli_logo-e1577697076704.png","width":200,"height":72,"caption":"Vestelli Oy"},"image":{"@id":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/product\/10088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/media\/10089"}],"wp:attachment":[{"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/media?parent=10088"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/product_brand?post=10088"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/product_cat?post=10088"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/vestelli-fi.kehityspalvelin.fi\/en\/wp-json\/wp\/v2\/product_tag?post=10088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}