Posted 20 hours ago

Hanna Instruments High Range Nitrate Checker HI 782

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About this deal

Our philosophy to be as close to our customers as possible has resulted in dedicated sales and technical support offices in over 40 countries. While our desire to be an innovator has produced many world firsts in the world of test instrumentation, and we continue to innovate and bring new solutions to the market in direct response to our customer needs. This includes saltwater aquariums that are fish-only or have corals that can tolerate elevated levels of nitrate up to 30 ppm or more.

I remember a BRS video several years ago where they were trying to get precise nitrate readings. IIRC, they ended up using a salifert test on a Hach meter. The optimum phosphate level - particularly for reef tanks - is often quoted as zero or 0.05 mg/L (ppm). Each HI781 is delivered in a case with custom insert and is supplied with: Marine Nitrate Low Range reagent starter kit (reagents for 25 tests), Sample cuvette and cap (2 pcs.), Filter paper (25 pcs.), Filter holder (1 pc.), Mixing vial and cap (1 pc.), 5 mL syringe with tip (1 pc.), 10 mL syringe (1 pc.), 1 mL graduated syringe (1 pc.), Plastic refilling pipette (1 pc.), 16 gauge blunt needle (1 pc.), 1.5V AAA Alkaline battery (1 pc.), and Instruction manual. Orthophosphates are found in natural waters and wastewaters. They are commonly added to drinking water as a corrosion inhibitor. The instantaneous analysis of orthophosphates by colorimetric determination provides rapid results using a standard analysis technique. Ideal for coral reef tanks and fresh and salt water aquariums CONS: Takes longer to test than any liquid test kit and lots of things to do and lots to clean following (mixing vial, sample cuvette, 2X syringes, needle, filter housing)

Pool and hot tub testing explained

With higher range measurements, such as the HI-782 which ranges from 0.0 up to 75.0 ppm (as NO3–), there is also no dilution procedure needed. VERDICT: It's good if you want accuracy and consistency (outside of user error), and looking to measure for very targeted nitrate levels...particularly <5ppm.

The problem with this test is it takes a long time to do (15-20 minutes) and much of that time you are busy shaking, mixing, filtering, etc, so you can’t really do much else. If was just a 15 min wait for the test to develop and read it would be easier. I have to wonder why they didn’t use the same process as the salifert test and measure the absorption? Also, Given the need to mix, transfer and filter, there/‘s no way to even automate the test. Phosphate directly inhibits calcification by corals and coralline algae - even at low levels. The health of plants in freshwater aquaria will also be impaired by raised levels of phosphate in the water. Phosphate naturally occurs as waste decomposes in coral reef, salt and fresh water aquariums. While it does not directly harm fish when levels are high, resulting green algae growth can deplete the oxygen levels in water. Corals can lose their colour due to the effects of brown algae.

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