Live Chat Support
    Free Shipping On $75+
  • FREE Shipping On $75+
  • 14-Day Low Price Guarantee
  • Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on
Orders Over $75
Standard ground shipping (1-7 business days) starts at a low $4.99 and most orders over $75 ship FREE. Learn More
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us. Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More
Home » Saltwater Aquarium Supplies  » Test Kits  » Nitrate  »  Elos Aqua Test Kit - Nitrate
Elos Aqua Test Kit - Nitrate

Elos Aqua Test Kit - Nitrate

Average Rating 2 5
Write A Review
Product Review
We value your opinion & experience
Thank you for taking the time to review our products!

This is a Product Review for: Elos Aqua Test Kit - Nitrate
Name to display on the review:
Location (ex: Anaheim, CA):
Your experience level:
How would you rate this product?
Review Title:
Write your review:
(Please focus on product quality and performance)
LOW STOCK ALERT: Only 8 left—order now!
In Stock: Buy now and your order will ship the next business day
Item #:
Was: $26.99
You Save: $2.70 (10%)
Notify Me
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
Add to Cart or Notify Me
This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.
Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

+ Add to Wishlist
Add to Wishlist
Select Wish List:
Comments (up to 200 characters):
Quantity Desired:
Quantity Received:
FREE Shipping Promo
MarineDepot.com offers FREE standard ground shipping via UPS on orders of $75 or more for orders containing non-overweight or oversize items (orders which do not qualify for our FREE shipping promotion will still be shipped at a discounted rate).

Terms and Exclusions:
  • Offer valid only on orders shipping within the contiguous United States. Orders shipping to Alaska, Hawaii, Puerto Rico, Guam or other US Territories do not qualify for this promotion.

  • This promotion does not apply to items requiring expedited shipping, such as refrigerated products, frozen products or live rock.

  • MarineDepot.com's FREE shipping promotion does not include products sent in oversized or particularly heavy boxes. This may include but is not limited to aquariums, canopies, chillers, external water pumps, metal halide magnetic ballasts, stands and substrate/sand. These items may be subject to additional shipping handling charges. Should shipping surcharges apply, they will be noted on individual product pages and / or displayed during check-out. We will, however, pay a portion of the shipping charges for these orders.

  • Shipping surcharges, such as special handling are NOT covered under the MarineDepot.com FREE shipping promotion.

  • Shipping charges for returned merchandise is non-refundable. Please read MarineDepot.com's Return PolicyPolicy for more information.

  • Price matched (Low Price Guarantee) or discounted orders do NOT qualify for our free shipping promotion.
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us.

Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions.
Shipping Cost*
Competitor's Website*
*Required information
Marine Depot 60-day Returns
At Marine Depot, we stand behind our products. That is why we offer a 60-day return period: one of the best in the industry! Learn More

Elos Aqua Test Kit - Nitrate Information

Product Manuals & Documentation


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.

    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.

    Elos Aqua Test Kit - Nitrate Reviews

    Average Rating
    (5 reviews)
    Sort Reviews By:

    Let me save you

    Reviewers Rating Unsatisfactory

    Posted: 3/5/2013 from NJ
    1.0 5
    Experience Level: Intermediate

    Comments: 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.

    3 of 3 People found this review helpful, did you? Yes No

    total waste of money

    Reviewers Rating Unsatisfactory

    Posted: 12/19/2010 from UNITED S
    1.0 5
    Experience Level: Intermediate

    Comments: 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 of 1 People found this review helpful, did you? Yes No

    Better than average test kit

    Reviewers Rating Great

    Posted: 10/14/2009 from NY USA
    4.0 5
    Experience Level: Intermediate

    Comments: 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 of 2 People found this review helpful, did you? Yes No

    not low-range

    Reviewers Rating Average

    Posted: 4/2/2008
    3.0 5
    Experience Level: Expert

    Comments: 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 of 4 People found this review helpful, did you? Yes No

    Very Poor Product

    Reviewers Rating Unsatisfactory

    Posted: 3/22/2008
    1.0 5
    Experience Level: Intermediate

    Comments: 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 of 8 People found this review helpful, did you? Yes No

    WIN A $350 RO/DI FILTER! Sign up for our best deals, how-to videos and your chance to win an AquaFx Mako RO/DI!