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Phosphates (PO4) are certainly among the most harmful dissolved compounds for the reef / marine aquarium. This is why it is advisable to measure them regularly. The addition of calcium hydroxide makes it possible to lower the phosphates (PO4) by making them precipitate.
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Salifert Phosphate Profi-Test
Erroneous results might be obtained when the carbonate hardness is higher that 20dKH. This corresponds to an alkalinity of 7meq/l. Normally the carbonate hardness is well below the above mentioned values.
Irritating: PO4-1 contains < 3.5 M HCL.
R36/37/38: Irritating to eyes, respiratory system and skin.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
Should you require an even higher sensitivity then double the water sample and the reagents. The scale should then be divided by 2.