NITRATE 90-Test Freshwater and Saltwater Aquarium Water Test Kit

I’ve been using the API Nitrate Liquid Test Kit for a while now and it’s been rock solid. The instructions are clear, the bottles are easy to work with, and the color chart is straightforward to read under normal lighting. I appreciate that it’s a true liquid test and not strips, so the results feel much more reliable and consistent. The test has helped me stay on top of nitrate levels in my tanks and catch trends before they become problems. The reagents last a long time, and as long as you follow the directions and shake bottle #2 thoroughly like it says, the readings are repeatable. Overall, it’s accurate, dependable, and worth having if you care about water quality. I wouldn’t hesitate to buy it again.

A must when setting up a new fish tank to make sure all parameters are safe before adding your inhabitants.

This Aquarium Water Test Kit is reliable, easy to use, and very helpful for keeping aquarium water safe. It provides accurate nitrate readings for both freshwater and saltwater tanks, making it great for monitoring water quality and preventing algae problems. The kit includes clear instructions and enough tests to last a long time.

Good to have on hand if your are new to fish aquariums or changing tanks.

I'm sure the product is fine as it is the same thing that comes in the master kit. However, be careful on Amazon when you select the 90-test versus the 180 test refill. The 90 is for nitrates and the 180 is for nitrites. I ordered the wrong one.

API kits are fairly accurate for the price, I highly recommend them for salt water aquarium owners that need and should have at least 2 kits of every important test type so they can cross reference results if they feel something is wrong with a particular test result. API fills that niche perfectly with pretty accurate easy to use kits that cost a quarter the price of the more accurate ones like Salifert, ELOS and Red Sea Pro. The API Nitrate Kit is as simple as it gets, just fill the vial to the marker or better yet use a syringe and add 5ml as directed. Then add 10 drops of reagent "A". swirl for a bit then shake reagent "B" for 30 seconds very vigorously and add 10 drops of that. Shake the whole thing for one minute vigorously and then wait 5 minutes to get a result. IMPORTANT NOTE: If you forget to shake reagent "B" you might as well throw the whole bottle of reagent out. This solution separates out in the container after a few hours into layers of different chemicals. If you don't shake it, you will be dripping out 10 drops of just one of those chemicals and remaining mixture will be compromised. The end result is that the next time you use it and shake it up properly the typically result is a lower reading than normal. Just remember to always shake reagent B properly for 30 seconds and you wont have any problems. If your Nitrates go down to reading Zero on the API kit, then it's time to move to a more accurate kit that is designed to read very low Nitrate levels. If your keeping a SPS Reef Tank you need the Nitrates to be near Zero and the API kit will not be accurate enough to read the small amounts that may be in your aquarium. For FOWLR Tanks, Nitrate is not as not as big of an issue, so an API kit or two is all you will probably need.

I worked in three pet shops as a teen and later managed the slat water department in a very large pet shop in Philadelphia. I have kept fish since I was five years old but have been on hiatus for the past 20 years and not had any tanks. These kits have been around for ages and are very accurate if you use them for their true intended purpose; freshwater community tanks or similar. Don't try and use these the nitrite or ammonia for saltwater tanks of any sort. Don't use the pH test kit for tanks that need exact pH values for high pH animals like cichlids (though this is less of a problem if you read below). These tests are extremely economical and provide many more tests per dollar than any other kits available. My son is six and my daughter is four. We decided to raise tadpoles twice this year and needed to monitor ammonia, nitrite, and pH. The 40-ish year old design of these kits still fit that bill perfectly and were exactly what we needed. I wish the scale on the pH kit went higher, but it goes high enough for community fish. Tadpoles here tend to like higher pH values of ~8.2 and the pH kit doesn't go that high. However, I got a rough enough estimate if the pH test indicated that the pH was off the chart high as water isn't going to go much above 8.2 unless you use chemical inappropriately. Ammonia and nitrite test kits worked perfectly as in the past and averted many potential tadpole disasters and crying children. We've kept snails, clams, some minnows, and loads of plants in the tank while the tadpoles have developed so the bio load was always changing. Still great kits even after 40 years at a very affordable price. Highly recommended for their intended usage scenario.

I don't think I'll ever buy another brand other than API again

A very useful test kit for keeping track of water quality in both freshwater and saltwater aquariums. The results are clear and easy to read using the colour chart, which makes monitoring nitrate levels straightforward even for beginners. The kit feels well made, and the glass test tube is sturdy and easy to clean after use. The instructions are simple to follow, and the testing process only takes a few minutes, making it convenient for regular weekly checks. It’s particularly helpful for spotting potential water quality issues before they affect fish or plants. Regular testing helps keep nitrate levels under control and supports a healthier aquarium environment. Overall, a dependable and practical kit that does exactly what it should. A good addition to any aquarium maintenance routine.

Producto indispensable para monitoreo de la salud de las bacterias que eliminan el amoniaco del agua salada de mis medusas.

Produit très simple d'utilisation, fiable et pas cher, le top!

merci marche tres bien

Easy to use. But I have to assume it is giving the correct reading. The colours can be a little vague.