Seachem MultiTest - Marine pH & AlkalinityMultiTest Marine pH & Alkalinity Unique dye that has a pronounced color change between 8. 0 and 8. 3 Multi cavity plate for simultaneous testing of up to 6 tests at the same time Includes reference for test validation Marine or high pH Freshwater Marine pH should be 8. 28. 4. Tanks dosed with limewater may go as high as 8. 6. Natural sea water has a total alkalinity of 23 meq L, but aquarium water should have a total alkalinity of 46 meq L. This test
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