Seachem pH Alert

Description

pH Alert™

Continuously monitors pH in freshwater
Seachem sensor technology
No tests, no strips
Lasts up to 4 times as long as competing products

Overview

pH Alert® is a unique color device designed to be placed in the aquarium or filter and monitor pH continuously. A sensor changes color reversibly from yellow to orange to red alerting you to shifts in pH levels between 5.4 and 8.0. Freshwater use only.

pH Alert® lasts up to 4X as long as competing products.
pH Alert® is also almost half the size of competing products. It’s small, clear, and unobtrusive, so it won’t detract from the view of your aquarium.

Interpretation
Simply place pH Alert® visibly anywhere in the aquarium or filter and match the sensor color to the corresponding pH reading on the color wheel. It’s that easy. No chemicals or test procedures are required. When first put in service, response time will be about 30 minutes. Thereafter, pH shifts will register within ten minutes.
Care
No care is required beyond removing algae with a clean, soft material. Do not use bleach, soap, detergents or hard objects to clean the sensor. Some dye medications may discolor the sensor. For maximum sensitivity, the unit should be read under natural daylight or daylight simulating light. Sensor exhaustion is indicated by a visible fading or washing out of sensor color. Once exhausted, it is time to replace pH Alert®

Using Seachem pH Alert in a Singapore freshwater tank

This little reference disc sits in the tank and gives you an at-a-glance read without pulling out a kit every morning. We find it genuinely handy in Singapore, where soft, slightly acidic tap water plus a tank full of driftwood and botanicals can drift the pH down slowly over weeks. A colour creeping toward the low end is your cue to do a water change before livestock notices anything.

It is a freshwater-only device and reads a broad band rather than a precise number, so treat it as a continuous early-warning sensor, not a replacement for an occasional liquid test. Keep it where you can see it against good light, away from heavy shade, and give it a gentle rinse if biofilm dulls the colour. Replace it once the sensor stops shifting between water changes.

See our full water testing and care range, and for context read our guide on how to read aquarium water tests and what to do about an aquarium pH crash.