Elos Aqua Test Kit - Nitrate

Read 5 Reviews Write a Review

In Stock: Order by 2PM EST for same-day shipping (M-F)

This item is in stock in our East and West Coast warehouses

$26.99 $41.99
You Save: $15.00 (35%)


Add to Wishlist


Elos USA


The Biological filtration is a method that uses naturally occurring nitrifying bacteria to detoxify nitrogenous wastes. One type of bacteria (Nitrosomonas spp.) converts ammonia to nitrite while another naturally occurring bacterium (Nitrobacter spp.) converts the nitrite into a far less harmful form of nitrogen waste: nitrate.

Nitrate is the final stage of the nitrification process. Many invertebrates, unlike fish, are not tolerable to high nitrate concentrations. As a result, it is extremely important to make sure that nitrate levels do not reach high levels. In freshwater aquaria the optimal level of Nitrate should be below 20 mg/l (ppm). Values of over 75 mg/l (ppm) should be avoided at all costs. In reef marine aquarium their level should not exceed 20 mg/l (ppm). A level of 10 mg/l (ppm) is the maximum for reef aquariums.

For these reasons the periodical testing of nitrate in the aquarium water should be considered especially during the aquarium set-up and periodically to avoid high level inside the water of our aquaria. Our kit allows the determination of the Nitrate level within a range of 5 – 75 mg/L (ppm).

ELOS AquaTest NO3, as well as all the other colorimetric test kit of this line, grant very high precision thanks to several procedures like the use of “RealColor” technology, an accurate system to calibrate the color chart compared to the reagents; the validation of each reagent with NIST (National Institute of Standard and Technology) certified samples and the careful stock management to supply to our customers ONLY the freshest production batch.


  • Easy reading: “RealColor” technology.
  • High precision: thanks to the use of calibrated droppers
  • NIST validation: each batch of elos reagents are validated using NIST (National Institute of Standard and Technology) samples
  • "Safe reagents": reagents and testing procedures are based on Low Risk Reagents. None of our test kits are based on Toxic Reagents.

  • Note: if the NO3 value is too high, we recommend a partial water change. Periodical checks on water quality can help to pinpoint causes of deviations in NO3 value and can prevent fish and invertebrates being harmed.

    Product Manuals & Documentation

    Elos Aqua Test Kit - Nitrate

    Owner's Manual available for download in Adobe PDF file format

    Manufacturer Info

    ELOS: the ultimate supplements and equipments for marine and planted aquariums.

    Elos is an aquaristik company that is exclusively dedicated towards the development, production, and marketing of specialised, high quality products for the aquarium market.

    We apply the latest advances in marine and fresh water sciences into our manufacturing and products. We are environmentally responsible as well as respectful of the key ethic rules on employment and production. Almost all our products are made in Italy, through few, well trained Internal Employee with the help of key external suppliers, Universities and Research Centres.

    Our commitment is to invest in the future, we take great care of details and innovations but beside this we also take care of our traditions. We apply modern process, but we also use traditional techniques, employing local craftsmen for the production.

    We take great care in designing our products, and packs to simplify their use making them pleasant to see and to touch. From the first contact with our products you will immediately perceive the care to produce them and the great attention toward each single detail.

    For all this we invite you, by heart, to try our products. Join your passion with us, use our products and make the best out of them and, we are sure, You will experience the delight of creating your personal, unique underwater world in a beauty you have never seen before.

    Dupe from NJ


    Experience Level: Intermediate

    Let me save you

    Similar fustrating color matching process where nothing matches. The vial is so frail it broke on me on my third test. It has left me willing to spend $100 on a professional test kit.

    4 out of 4 found this review helpful

    Was this review helpful?

    rk from UNITED S


    Experience Level: Intermediate

    total waste of money

    Colors are not even close to the options on the card, save your money, I threw $30 down the drain on this purchase.... Elos, come on, you can better....

    1 out of 1 found this review helpful

    Was this review helpful?

    tegee from NY USA


    Experience Level: Intermediate

    Better than average test kit

    I enjoyed using this test kit and feel it is better than average vs. others in its category. The only thing I do not like about it is that it is still hard to differentiate the color variance when reading between readings. It is like most in that category unfortunately, but I would buy and use again.

    2 out of 2 found this review helpful

    Was this review helpful?

    someguy from


    Experience Level: Expert

    not low-range

    never have trouble figuring out the colour but it's not low range enough. if you try to keep your nitrate below 1ppm it's not the kit to use.

    2 out of 4 found this review helpful

    Was this review helpful?

    Brad from


    Experience Level: Intermediate

    Very Poor Product

    This test, like the others made by Elos seem to give incorrect results, are way over priced, and the lids to the vials do not even fit properly so when they expect you to shake them for 5 full minutes, you end up with about half the water left in the vial you started with. My seachem test and API test showed I had 40ppm nitrates in my tank which I believe since I was starting to see Cyano and green hair algae yet this test showed 0 nitrates. The testing process is also much more of a pain than API and Seachem. I am very disappointed with this product and the entire Elos testing line.

    5 out of 8 found this review helpful

    Was this review helpful?

    Accessories for Elos Aqua Test Kit - Nitrate

    Similar Items