Nja, om vi pratar Hanna checkers så ja, men inte i verkligheten
https://www.advancedaquarist.com/2010/10/aafeature
"
Phosphorus can be found in water in various forms or species, including:
Reactive Phosphate or Orthophosphate: Reactive P (also called ortho-phosphate) is 'bio-available' for promotion of algae growth. Reactive P can be dissolved or suspended. Colorimetric tests for phosphates commonly available to hobbyists measure only orthophosphates, although small amounts of easily hydrolyzable inorganic and organic P might be included in the result. The most abundant forms of orthophosphates occurring between pH 5 to 9 in aquatic environments are HPO4-2, H2PO4-, PO4-3, HPO4-2, and H2PO4 (Stumm and Morgan, 1981).
"