Seachem pH Alert (6 Month)
Water type
Freshwater
Replace every
6 months
Seachem pH Alert (6 Month)
Know your pH at a glance, every day – no strips, no drops. Seachem pH Alert is a continuous colour-changing sensor for freshwater aquariums. Placed anywhere visible in the tank or filter, its sensor shifts reversibly from yellow through orange to red as pH moves between 5.4 and 8.0 – just match the sensor colour against the included colour wheel to read your pH.
Key features
- Continuous monitoring – catches pH swings between water tests, rather than only the moment you happen to test.
- Reads pH from 5.4 to 8.0 on a simple colour wheel – no reagents, no liquid tests.
- Fast response – first reading available around 30 minutes after installation; after that, pH shifts register within roughly 10 minutes.
- Long service life – rated for around 6 months of continuous use, up to 4× longer than competing colour indicators.
- Compact – nearly half the size of competing monitors, so it stays unobtrusive in the display.
- Freshwater use only – not formulated for marine or brackish water.
Specifications
| Brand | Seachem |
|---|---|
| Product | pH Alert |
| Water type | Freshwater only |
| pH range read | 5.4–8.0 |
| Initial response time | Approximately 30 minutes after installation |
| Subsequent response time | Approximately 10 minutes |
| Rated service life | Around 6 months |
| Reading method | Colour wheel comparison, no reagents required |
| SKU | 725035-20 |
| Barcode | 116002004 |
Care
- Wipe algae away with a clean, soft material only – no bleach, soap, detergents or hard objects
- Some dye-based medications may discolour the sensor
- Read under natural or daylight-spectrum lighting for best sensitivity
- Replace the unit when the sensor colour visibly fades or washes out – that's the end-of-life signal, generally around 6 months of continuous use
Suitable for, and not suitable for
- Suitable for: freshwater community, planted and cichlid tanks where you want an at-a-glance pH check between full water tests.
- Not suitable for: marine or brackish aquariums – the sensor and colour range are calibrated for freshwater pH only. Use a marine-specific test kit for saltwater systems.
Warranty and delivery
Covered by Seachem's standard quality guarantee at the time of sale, in addition to your rights under Australian Consumer Law. Ships as a standard parcel.
Common questions
Can I use pH Alert in a saltwater tank?
No. pH Alert is formulated for freshwater use only and isn't calibrated for marine pH ranges.
How do I know when it needs replacing?
When the sensor colour visibly fades or washes out, it's exhausted and ready to be replaced – generally after around 6 months of continuous use.
Does it replace a liquid pH test kit?
It's a continuous, at-a-glance monitor rather than a precision test – it's best used alongside occasional liquid testing, not as a full replacement for it.
Will medications affect the reading?
Some dye-based medications can discolour the sensor and affect its accuracy while they're in the water.
Where should I place it?
Anywhere it stays visible in the tank or filter – visibility is what makes it useful as an at-a-glance check.
