Colombo PH Test

If your koi seem unsettled or your filter isn’t performing as expected, check your pH first. The Colombo pH Test gives you a clear reading of your pond’s acidity level, so you can keep conditions stable and safe.

pH measures how acidic or alkaline your water is. Sudden shifts can stress fish and disrupt your biological filter. Regular testing helps you spot changes early and respond calmly.

Why pH matters

• Koi prefer stable water, not sudden swings
• Extreme pH can stress or harm fish
• Biological filtration works best within a steady range
• Heavy rain, water changes and new additions can affect levels

Testing takes a few minutes and gives you confidence that your water chemistry is on track.

What’s included

• Liquid drop test reagents
• Test tube
• Colour comparison chart
• Instructions

The clear colour chart makes readings straightforward, whether you’re carrying out routine checks or investigating a water quality issue.

When to test

• Weekly during peak season
• After heavy rainfall
• Following large water changes
• If fish behaviour changes

Good practice & safety

• Rinse the test tube with pond water before and after use.
• Store reagents cool and out of direct sunlight.
• Keep chemicals out of reach of children and pets.

Consistent pH testing keeps your pond predictable – and predictable water keeps koi thriving.