Seachem Prime vs Tetra AquaSafe: regional labels and dose differences

Quick answer

Prime and AquaSafe cannot be compared using the product name alone. This page compares standard Seachem Prime with the UK/EU AquaSafe directions. It does not supply an AquaSafe Plus or US AquaSafe recipe.

Compare like-for-like water preparation

Worked example: a 20 L replacement batch

At these stated references, 20 ÷ 200 × 5 gives 0.5 mL of Prime. For UK/EU AquaSafe, 20 ÷ 10 × 5 gives 10 mL. This is a comparison of label amounts for a stated application, not evidence that the smaller amount is more effective.

Which bottle is in your hand?

Match the full name, market and printed dose before entering a volume. An AquaSafe Plus bottle with different instructions is outside this comparison and the UK/EU calculator. Read the label-versus-website checklist when the references disagree.

Preparation and practical limits

Tetra instructs users to shake AquaSafe and stop the protein skimmer for marine application. Do not transfer one maker’s equipment or emergency instructions to the other product. This comparison does not establish a species-specific dose or blanket compatibility with medication.

Which is better value?

For the stated references, a millilitre treats different volumes. Compare the actual bottle price and labelled capacity for the same job; prices and formulations change. Claims that one is a “professional” choice or universally safer are not supported by this arithmetic.

Use the matching tool

Prime calculator · UK/EU AquaSafe calculator · Choose the water-volume boundary.

Sources and review scope

• Seachem Prime directions
• Tetra AquaSafe official EU English directions

Manufacturer directions checked 28 October 2026. This is a label comparison and practical calculation guide, not an independent efficacy trial. Follow the exact bottle and resolve conflicting instructions with its manufacturer.