Red Sea Phosphate Pro Testing Kit 100 Tests
Water type
Marine
Number of tests
100 tests
Red Sea Phosphate Pro Testing Kit 100 Tests
Measures phosphate down to the level that actually shapes coral colour. The Red Sea Phosphate Pro is a colour-comparator test kit built for reef aquariums, where the difference between a healthy SPS system and a nuisance-algae outbreak often sits inside a range most hobby test kits can't resolve. It reads 0–5 ppm PO4 to an accuracy of ±0.02 ppm, giving a result precise enough to guide dosing rather than just confirm phosphate is present.
Key features
- 0–5 ppm range at ±0.02 ppm accuracy – resolves the low readings that matter in a reef tank, where many kits can't distinguish 0.05 ppm from 0.15 ppm
- Colour comparator method – no digital meter to calibrate, no photometer needed
- 100 tests per kit – weekly testing for close to two years before a refill is needed
- Reagent refill available – restock the chemistry without buying the comparator again
- Part of the Red Sea Reef Care Program – designed to be read alongside Nitrate Pro results to guide biological nutrient reduction
Specifications
| Measurement range | 0–5 ppm PO4 |
|---|---|
| Accuracy | ±0.02 ppm PO4 |
| Tests per kit | 100 |
| Test method | Colour comparator |
| Water type | Saltwater (reef) |
| Refill available | Yes – Red Sea Phosphate Pro Reagent Refill Kit, 100 tests |
What's included
- Comparator block and viewer
- Test vials
- Reagents for 100 tests
- Instructions
Reading the result
Red Sea's own nutrient management guidance gives different phosphate targets depending on what the system is aiming for, not one single correct number.
| System type | Target PO4 |
|---|---|
| Mixed reef / SPS frag tank | 0.08–0.12 ppm |
| SPS-dominant system | 0.01–0.02 ppm |
| Ultra-low nutrient system (ULNS) | 0 ppm (undetectable) |
Suitable for, and not suitable for
- Suitable for saltwater and reef aquariums monitoring phosphate as part of a nutrient control or dosing routine
- Not suitable for freshwater test panels – the range and colour scale are calibrated to reef-tank chemistry
- Not a substitute for ICP testing where lab-grade trace-element precision is required
Goes well with
- Red Sea Phosphate Pro Reagent Refill Kit – restock the chemistry once the 100 tests are used
- Red Sea Marine Care Multi Test Kit – for a broader saltwater parameter panel alongside phosphate
Warranty and delivery
Reagents carry a use-by date printed on the pack – check it before testing, since expired reagents give false readings. Consumer guarantees apply under Australian Consumer Law in addition to any manufacturer terms. Standard parcel delivery applies.
Common questions
How many tests does this kit include?
100 tests. A weekly testing routine will run for close to two years before the reagents need restocking.
Do I need the full kit or the reagent refill?
Buy the full kit if this is your first Phosphate Pro test kit – you need the comparator and vials. If you already own a Phosphate Pro comparator and only need fresh chemistry, the reagent refill restores the same 100 tests at a lower cost.
Can I use this on a freshwater tank?
It's built and calibrated for saltwater reef chemistry. A freshwater-specific phosphate test is a better fit for planted or community tanks.
What phosphate reading should I be aiming for?
It depends on the system – see the target range table above. A mixed reef sits higher than an SPS-dominant or ultra-low-nutrient system.
Why does my phosphate reading not match my nitrate reading?
Phosphate and nitrate don't always move together – test both, since Red Sea's nutrient control approach reads the two side by side rather than in isolation.
