{"id":16525,"date":"2026-02-13T07:03:59","date_gmt":"2026-02-13T01:33:59","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16525"},"modified":"2026-02-13T07:04:01","modified_gmt":"2026-02-13T01:34:01","slug":"testing-ph-of-aquariums-tap-water-and-drinking-water","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/testing-ph-of-aquariums-tap-water-and-drinking-water\/","title":{"rendered":"Testing pH of aquariums, tap water and drinking water!"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/ixmHTZYhHFg?si=SjTeVNiNyb78TOQo\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Used the the pH reagent from <a href=\"https:\/\/amzn.to\/4kET6yk\" type=\"link\" id=\"https:\/\/amzn.to\/4kET6yk\">Freshwater Master Test Kit bought from Amazon<\/a>, which can test 200 samples for pH, ammonia, nitrate and nitrite. Testing pH is quite easy. You have to wash the test tube and sample collection syringe with the water to be tested itself. Take the pH reagent, shake well and pour 3 drops into 2.5 ml of test sample. Shake well and read the pH by comparing with the colour chart after 5 seconds. Here are a few sample tests which we conducted on different samples here!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Goldfish aquarium was tested first. That showed a pH of about 7.5. Goldfish thrive in slightly alkaline water, with an ideal range typically between 7.0 and 8.4. A pH of 7.5 is perfectly within their comfortable range and provides a stable, healthy environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Next we tested the pH of drinking water at home which has been boiled and cooled. The pH was seen as 7.0. pH of 7 is considered perfect for drinking water, as it is neutral. Boiling water typically brings it to a neutral state, fitting well within the ideal <a href=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/wash-chemicals\/ph.pdf\" type=\"link\" id=\"https:\/\/cdn.who.int\/media\/docs\/default-source\/wash-documents\/wash-chemicals\/ph.pdf\">6.5\u20138.5 pH range<\/a> recommended for safety and consumption. While hot water can temporarily lower pH to around 6.5\u20136.8, this is normal and harmless.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Water from overhead tank, stored from tap water was found to have a pH of 6.5. A pH of 6.5 in stored overhead tank water is likely caused by factors other than just residual chlorine, although chlorine does play a minor, temporary role. Important cause mentioned is absorption of carbon dioxide from air getting converted to carbonic acid which can lower the pH. Low pH can potentially increase the corrosion of metallic pipes and accessories. A simple option seemed to be storing the water for shorter periods to reduce carbon dioxide absorption.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">pH of water from a small aquarium for guppies was also found to be 6.5! A pH of 6.5 is generally okay and considered safe for guppies, as they are hardy fish that can adapt to a range of 6.5\u20138.0, with some sources citing up to 8.5. While 6.5 is on the lower end (slightly acidic) and they prefer neutral to slightly alkaline water (7.0\u20138.0), they will likely thrive. Our immediate action was to change 50% of the water to improve pH, which has to be retested after 24 hours.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Striking result of 5.5 pH was noted in a tarpaulin tank. Reason was also quite obvious, it contained larger fish and tank cleaning had been delayed a bit. That is what is called as &#8220;Old Tank Syndrome&#8221;. There was algae growing along the sides of the tank as well. Water change was initiated along with thorough cleaning of the sides of the tank. It is also possible to bring up the pH using small amounts of baking soda. But large and quick changes of pH are not good for fish. Another DIY option considered was using powdered egg shell inside a filter to gradually buffer the pH on a long term basis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Please note that the Amazon link is an affiliate link. If you buy using that link, Amazon will pay me a tiny amount, at no extra cost to the buyer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>Used the the pH reagent from Freshwater Master Test Kit bought from Amazon, which can test 200 samples for pH, ammonia, nitrate and nitrite. Testing pH is quite easy. You have to wash the test tube and sample collection syringe with the water to be tested itself. Take the pH reagent, shake well and pour [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16526,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16525","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Testing pH of aquariums, tap water and drinking water! - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/testing-ph-of-aquariums-tap-water-and-drinking-water\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Testing pH of aquariums, tap water and drinking water! - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Used the the pH reagent from Freshwater Master Test Kit bought from Amazon, which can test 200 samples for pH, ammonia, nitrate and nitrite. Testing pH is quite easy. You have to wash the test tube and sample collection syringe with the water to be tested itself. Take the pH reagent, shake well and pour [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/testing-ph-of-aquariums-tap-water-and-drinking-water\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-13T01:33:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-13T01:34:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2026\/02\/Testing-pH-of-aquariums-tap-water-and-drinking-water.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"679\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/testing-ph-of-aquariums-tap-water-and-drinking-water\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/testing-ph-of-aquariums-tap-water-and-drinking-water\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"Testing pH of aquariums, tap water and drinking water!\",\"datePublished\":\"2026-02-13T01:33:59+00:00\",\"dateModified\":\"2026-02-13T01:34:01+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/testing-ph-of-aquariums-tap-water-and-drinking-water\\\/\"},\"wordCount\":516,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/testing-ph-of-aquariums-tap-water-and-drinking-water\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/Testing-pH-of-aquariums-tap-water-and-drinking-water.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/testing-ph-of-aquariums-tap-water-and-drinking-water\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/testing-ph-of-aquariums-tap-water-and-drinking-water\\\/\",\"name\":\"Testing pH of aquariums, tap water and drinking water! 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