Hanna Checker – Phosphate ULR


Hanna Checker HI774 – Marine Phosphate ULR is designed exclusively for use on marine aquariums. It offers a quick, easy and highly accurate method of measuring lower levels of phosphate in your aquarium.

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Hanna Checker – Phosphate ULR (ultra low range) is an easy to read test kit suitable for marine aquarium keepers of all levels and experience.

This kit is the HI-774 Handheld Colorimeter for testing low levels of phosphate (between 0.00 – 0.90ppm) in your marine aquaria.

Reagent available for more tests: HI774-25

Maintaining correct levels of phosphate in your aquarium is essential for the health of all your tanks inhabitants. High phosphate can either be a contributing factor or potentially the direct cause of some serious algae problems and blooms. Higher levels can also inhibit coral growth and cause corals discolour or become unhealthy. Too low a level of phosphate can also have detrimental effects on corals and other livestock.

The more precise and stable the levels, the better the results. With regular, precise monitoring, fluctuations in levels can be quickly corrected, giving your corals the best chance of success.

Ideal for;

  • Salt water aquariums
  • Coral reef tanks
  • Water quality

Main Benefits;

  • Testing is quick and easy
  • High precision results – more accurate than standard chemical test kits
  • Auto shut-off feature means the Checker cannot be left on by mistake
  • Fully portable, fitting easily into both palm and pocket

Four steps, one click instant readout:

  • Zero the Checker
  • Add reagent
  • Insert sample into Checker
  • Press button for results


Marine Po4

Historically, phosphate has been seen as a bit of a nuisance and the cause of a lot of problems when it comes to keeping aquariums. Nowadays, due to massive improvements in both equipment and knowledge we have a much better understanding of the role phosphate plays within the closed system of a fish tank.

High levels of phosphate can cause serious algae issues and can also have a detrimental effect on other livestock. However, we now know, especially for reef aquariums, that no reducing levels until there is no phosphate at all can cause its own issues. This is especially noticeable when it comes to coral growth and health and has also been attributed to issues with pests such as dinoflagellates.

In natural seawater phosphate is very low to almost non-existent, but the ocean is far more complicated than the closed system of an aquarium!

For reef aquaria and especially SPS coral care we recommend maintaining a Po4 level between 0.05 and 0.1ppm.

For fish only systems we would recommend a Po4 no higher than 0.5.

The Hanna Checker – Phosphate ULR is perfect for checking phosphates within this range and ensuring the levels don’t drop too low.

For testing at higher levels we would recommend using –


Hanna Checker – Phosphate ULR is supplied with;

  • 2 sample cuvettes
  • Cuvette cap
  • Starter pack of reagents HI774-25
  • 1 x 1.5 AAA battery
  • Instructions


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