JBL PROAQUATEST PO4 Phosphate Sensitive Refill – Reagent Top-Up
Keep your phosphate testing routine going with the JBL PROAQUATEST PO4 Phosphate Sensitive Refill. This reagent top-up restores your kit’s capacity for low-range phosphate (PO43−) measurements in freshwater, marine aquariums, and ponds, helping you control algae risk and maintain stable, healthy water.
Why choose the refill?
- Cost-effective: Replace only what you’ve used, no need to buy a full kit.
- Eco-friendly: Reuse your original vial/cuvette and colour card.
- Consistent accuracy: Fresh reagents ensure precise, repeatable low-range readings.
- Freshwater & marine: Suitable for planted, community, and reef systems.
What’s included
- Replacement liquid reagents for PO4 Phosphate Sensitive testing
Note: This is a refill pack. It does not include a test vial/cuvette, syringe/spoon, or the colour comparison chart. Use with your existing JBL PROAQUATEST PO4 Phosphate Sensitive kit.
How to use (with your existing kit)
- Rinse your original JBL test vial/cuvette with sample water and fill to the mark.
- Add the specified drops of the refill reagents following your kit’s instructions.
- Cap, mix gently, and wait for the indicated reaction time.
- Compare the sample colour to your original PO4 colour chart under neutral light.
- Record results to track trends and fine-tune feeding and filtration.
Pro tips
- Rinse frozen foods and avoid overfeeding to limit phosphate input.
- Store reagents upright, cool, and out of direct light for best longevity.
- For reduction, use quality phosphate media, regular water changes, and (marine) efficient skimming.
- Test NO3 alongside PO4 to maintain a balanced nutrient ratio.
FAQs
Is this refill suitable for reef tanks?
Yes. It supports the low-range sensitivity needed for reefs.
Does the refill include a colour chart or vial?
No. Reuse the accessories from your original JBL PO4 Sensitive kit.
How often should I test phosphate?
Weekly is a good baseline; test more frequently when adjusting feeding, using media, or if algae appears.


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