Search  for anything...
API

API CALCIUM TEST KIT Saltwater Aquarium Water 1-Count Test Kit

  • Based on 746 reviews
Condition: New
Checking for the best price...
$13.65 Why this price?

Buy Now, Pay Later

As low as $3 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Oct 12
Order within 11 hours and 36 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: 1 Count


Style: Aquarium Water Testing


Features

  • Contains one (1) API CALCIUM TEST KIT Saltwater Aquarium Water 1-Count Test Kit, including 2 bottles of testing solution and 1 test tube with cap
  • Helps monitor calcium and prevent invisible water problems that can be harmful to coral & crustaceans
  • Accurately detects calcium levels from 0-4 ppm
  • Prevents low levels of calcium which inhibit corals and crustaceans growth
  • Use for weekly monitoring and when water or aquatic life problems appear

Description

Keep your aquatic life healthy and thriving by testing your aquarium water's calcium levels regularly with this easy-to-use API CALCIUM TEST KIT for aquariums.Testing water parameters weekly helps prevent invisible water problems that can be harmful to fish. Calcium is one of the most important elements in a reef aquarium. Reef invertebrates such as corals, crustaceans, mollusks and even some types of encrusting algae need calcium to grow and remain healthy. Over time, calcium levels drop as invertebrates use calcium in aquarium water. The API CALCIUM TEST KIT measures calcium levels as low as 20mg/L. It contains two calcium test bottles, capped test tube and instructions. For use in reef aquariums. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

Brand: API


Item Weight: 68.04 g


Item Form: Liquid


Number of Packs: 1


Unit Count: 1 Count


Product Dimensions ‏ : ‎ 2.75 x 1.63 x 5.13 inches; 2.4 ounces


Manufacturer recommended age ‏ : ‎ 1 month and up


Item model number ‏ : ‎ 69L


Department ‏ : ‎ men, women


Date First Available ‏ : ‎ June 20, 2004


Manufacturer ‏ : ‎ Mars Fishcare


Best Sellers Rank: #2,438 in Pet Supplies (See Top 100 in Pet Supplies) #4 in Aquarium Test Kits


#4 in Aquarium Test Kits:


Customer Reviews: 4.4 4.4 out of 5 stars (746)


Brand Name: API


Number of Packs: 1


Unit Count: 1 Count


Manufacturer: Mars Fishcare


UPC: 317163120699


Number of Items: 1


Global Trade Identification Number: 99


Item Type Name: Aquarium Test Kit


Model Number: 69L


Manufacturer Part Number: 69L


Item Weight: 68.04 g


Item Form: Liquid


Pet Type: Fish


Target Species: Invertebrates


Allergen Information: Apple Free


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Oct 12

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Easy to use test and great for my purposes
Style: Aquarium Water Testing
This is a great test. It's easy to use and one kit will give you several months of tests. The test itself is very straightforward using a method called titration: add drops from bottle 1, shake, then add drops from bottle 2 until the solution turns from pink to the purple color indicated on the instructions. In-between drops from bottle 2, you invert the tube with the cap securely on. The more drops you need from bottle 2, the more calcium you have. You check the back of the instructions to translate number of drops to ppm. I have been keeping SPS, LPS, softs, and calcium-reliant macro algae in a small (25 gallon) system for some time with this kit and have had no calcium problems. As a quick tip: if you have multiple tests you run in beakers, get a 100cc syringe and attach some airline hose to the end. That way, you can fill the syringe with about 30cc of tank water and squirt it into each beaker to get the perfect amount in each (usually 5cc). No more dipping beakers in your tank and pouring some out, refill, pour out, refill, etc. Just put in 5cc directly and voila! Mine came with instructions and everything I needed. I have had no problems using this. Note that, the higher your calcium levels, the more drops from bottle 2 it will take and, thus, the fewer total tests you will get from this kit. ... show more
Reviewed in the United States on June 8, 2014 by James Z.
    • Does a great job of measuring calcium!
Style: Aquarium Water Testing
I initially purchased the API Freshwater Master Kit and used it for many years before moving into the saltwater side of the hobby. I then purchased the Saltwater Master Kit (which I found was no different than the Freshwater one, except for the results card) and have used it for over a year, testing my parameters when I see fit. Once you have an established aquarium, the need to check parameters is greatly reduced...thankfully. However, once I started adding corals to my tank, I began reading online about Alkalinity and Calcium and how critical they are for the growth and health of corals. At the time, I didn't think much of it and continued maintaining my tank as I did before. Throughout the first year of owning my tank I would encounter new situations, such as algae growth and corals being closed. The latter was a pretty big concern because I believed it meant my corals weren't "happy". I began searching for reasons why they might be closed up. I chose to purchase both the calcium and carbonate hardness (alkalinity) kits to test my water. I was surprised when my tank was right where it should be. In fact, EVERY time I have checked calcium and alkalinity levels they are fine. I would eventually find the real reasons why my corals were closed (one of which is that sometimes they just close for a day or two to "recharge") aside from a calcium and alkalinity imbalance. While these API products are great, I would recommend that unless you are keeping a huge tank full of corals, or are keeping a large amount of SPS corals, there's no real need to purchase the additional calcium and alkalinity tests. If you want to make sure all your parameters are perfect, they are good products, but for smaller tanks and hobbyists keeping softies and LPS corals along with doing regular water changes, save yourself some money and time on maintenance! ... show more
Reviewed in the United States on September 29, 2015 by BBestvin
    • Cheap and works.
Style: Aquarium Water Testing
People debate the accuracy of this all the time when compared to the higher end test kits. For me, it simply works. The resolution of the testing is to 10 ppm and other products go .5 ppm. I'm personally okay with knowing I'm either 420 PPM or 410 PPM weekly. The point is to graph and understand the trend line over time. If you're trying to track specific daily fluctuation you're better off going with a higher end kid. For me it works and is simple to use for my application. Tip: 10 drops of Bottle #1 and shake. When you start bottle #2 you'll start seeing a trend based on your tank consumption. For my tank, I'm consistently at 400+ PPM. So for Bottle #2, I put in 19 drops at the same time and shake. Then add additional drops until I see the color change. Don't add a drop and shake starting at the beginning or you'll be there all day. ... show more
Reviewed in the United States on June 7, 2017 by Kevin
    • Works well and accurate
Style: Aquarium Water Testing
Accurate and affordable
Reviewed in the United States on April 11, 2024 by Jake Bigelow
    • Nothing Wrong With AP Tests
Style: Aquarium Water Testing
AP test kits work. I've used them for years and had no problems with getting consistent results. You do have to completely follow the instructions, and you need to read the results in daylight, not the LED or flourescent light over your tank.
Reviewed in the United States on March 25, 2023 by Dianne Sorrell
    • Simple and Accurate
Style: Aquarium Water Testing
Great, easy to use test kit that reads Calcium levels through titration. Adding 10 drops of the binder and then titrating N drops of re-agent until the color changes. The reading is 20ppm per drop of re-agent added. Calcium should be tested often in a reef aquarium and buying an easy to use kit like this makes it more likely to stay on top of your water chemistry. ... show more
Reviewed in the United States on December 30, 2013 by Winfield
    • Not for fresh water
Style: Aquarium Water Testing
If you want to test fresh water, this kit is not for you. The color will not turn pink after adding the first bottle drops. Only works on saltwater.
Reviewed in the United States on February 7, 2023 by Ron
    • Good value and fairly accurate
Style: Aquarium Water Testing
Fairly accurate and somewhat easy to read, but the color variations can be difficult to see
Reviewed in the United States on July 14, 2020 by Jim Dusenberry

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...