Sera Po4 Test (Phosphate)
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Phosphate Test for Fresh and Saltwater — Prevent Algae Growth by Monitoring Phosphate
Sera PO₄-Test — approx. 60 measurements, quick and easy results
✅ Level: Easy — Simple to use. Results within minutes.
Phosphate (PO₄) is a nutrient for plants in small quantities, but an excess is the main cause of algae growth in aquariums. Fish waste and overfeeding are common causes of elevated phosphate levels. The Sera PO₄-Test provides quick and easy insight into the current phosphate level — in both fresh and saltwater. Sufficient for approx. 60 measurements.
🔧 Product Specifications
| Type | Water test — phosphate (PO₄) |
| Suitable for | Freshwater and saltwater |
| Number of measurements | Approx. 60 measurements |
| Ideal value | < 0.1 mg/l (planted freshwater aquarium) |
| Brand | Sera |
🚚 Delivery & Warranty
- Fast delivery from our store — ready to use immediately
- Shipping Tuesday or Friday → Read more about shipping
- Delivery with track & trace, usually within 1–2 working days
- Problem with your order? We will solve it together. Contact our customer service.
- Free shipping from €59,-
✂️ Usage Tips
Test the phosphate level regularly, especially with algae problems. If the phosphate level is too high: perform partial water changes, feed less or less frequently, and use Sera Phosvec Granulat to actively remove phosphate from the filter.
💡 Tip
Combine the PO₄-Test with the Sera FE-Test for a complete picture of the nutrient balance in your planted aquarium — iron up, phosphate down is the ideal recipe against algae.
❓ Frequently Asked Questions
What is an acceptable phosphate level?
In a planted freshwater aquarium, aim for less than 0.1 mg/l. In an aquarium without plants, it can be slightly higher, but keep it below 0.5 mg/l to limit algae growth.
How do I lower the phosphate level?
Use Sera Phosvec Granulat in the filter for sustainable phosphate removal. Combine with less feeding and regular water changes.
How often should I test the phosphate level?
For algae problems: weekly. For a stable aquarium: monthly is sufficient.
Do you have another question? Feel free to contact us — we are happy to help you make the right choice for your aquarium.
