{"id":7074,"date":"2021-01-04T10:24:01","date_gmt":"2021-01-04T08:24:01","guid":{"rendered":"https:\/\/medusea.es\/information\/preparing-saltwater-for-jellyfish\/"},"modified":"2025-08-05T11:46:57","modified_gmt":"2025-08-05T09:46:57","slug":"preparing-saltwater-for-jellyfish","status":"publish","type":"page","link":"https:\/\/medusea.es\/en\/information\/preparing-saltwater-for-jellyfish\/","title":{"rendered":"Preparing Saltwater for Jellyfish"},"content":{"rendered":"\t\t
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Inicio<\/a><\/span><\/span><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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The water used must be reverse osmosis or distilled water<\/strong>\u2014never tap water, as it may contain toxic substances or components such as heavy metals or high levels of chlorine, which are harmful to jellyfish. Deionized or RO water can be purchased at most supermarkets or pet stores. <\/p>

You will mix the appropriate amount of salt with the desired number of liters of water, following the manufacturer’s recommended dose\u2014typically 30\u201332 grams<\/strong> per liter of water to reach a specific gravity of 1.022.<\/strong><\/p>

To start up the system, it’s best to prepare the mix outside the aquarium. If you\u2019re setting up a new tank, it can be done directly in the aquarium. Let the mixture sit for at least 24 hours<\/strong> to dissolve completely. Stir occasionally for better dissolution or use an air pump. <\/p>

After 24 hours, measure the salinity using a hydrometer, densimeter, or refractometer. Adjust by adding more salt or more deionized\/distilled<\/strong> water if needed.<\/p>

If you are just starting the tank:
Turn on the aquarium pump to finish mixing and help stabilize pH<\/strong> and oxygen levels.<\/p>

For water changes, always prepare the artificial seawater<\/strong> in containers outside the aquarium. Add the required dose of salt to deionized water, stir to dissolve, and wait 24 hours before use. <\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\n\t\t\t\t\t\tImportant Information<\/span>\n\t\t\t\n\t\t\t\t\t\tWe do not recommend using natural seawater, as it may contain microorganisms that could colonize your tank and cause an unwanted infestation that is very difficult to eliminate. If you must use it, always pass it through a UV sterilizer. <\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\tWater Treatment\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
\n\t\t\t\t\t\tEverything you need to simulate a healthy marine environment\t\t\t\t\t<\/div>\n\t\t\t\t\n\t\t\t\t\t\t\t\t\t
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The water used must be reverse osmosis or distilled water\u2014never tap water, as it may contain toxic substances or components such as heavy metals or high levels of chlorine, which are harmful to jellyfish. Deionized or RO water can be purchased at most supermarkets or pet stores. You will mix the appropriate amount of salt […]<\/p>\n","protected":false},"author":89,"featured_media":5857,"parent":6644,"menu_order":2,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"sidebar-2","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"enable","ocean_disable_heading":"enable","ocean_post_title":"","ocean_post_subheading":"To prepare artificial seawater, special aquarium salts must be used (never regular table salt). You can find them in our online store at medusea.es.<\/a> ","ocean_post_title_style":"background-image","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"off","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","footnotes":""},"class_list":["post-7074","page","type-page","status-publish","has-post-thumbnail","hentry","entry","has-media","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-horizontal","has-no-thumbnails","has-product-nav","circle-sale"],"yoast_head":"\nPreparing Saltwater for Jellyfish jellyfish - 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