Seachem MultiTest: Phosphate

Seachem MultiTest: Phosphate is a high‑sensitivity aquarium water test kit designed to measure inorganic phosphate (PO4) in both marine and freshwater systems. It can detect phosphate to less than 0.05 mg/L and uses a distinct yellow–green–blue colour range for easier matching compared to many “blue only” tests. The kit performs over 75 tests and includes a reference sample so you can verify the test is working correctly when you need extra confidence in your results.

MultiTest Phosphate is especially useful for reef aquariums where low phosphate control is critical, but it can also be used in freshwater (note: Seachem advises freshwater phosphate levels are often beyond the kit range and may require dilution with distilled water). The included multi‑cavity test plate lets you run and compare multiple samples side‑by‑side, which is handy for testing display tanks, quarantine, and source water in one session.

Key features

• Measures inorganic phosphate to <0.05 mg/L.​

• Range: 0–3.0 mg/L phosphate; precision increments shown on the chart (0.001–0.1 mg/L).

• Over 75 tests per kit.​

• Includes reference sample for validation.

• Multi‑cavity test plate for running several tests at once.