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Red Sea Reef Foundation Pro Test Kit (Calcium/Alkalinity/Magnesium)


Item #: RS21510

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Red Sea`s Reef Foundation Kit includes high accuracy titration tests for the accurate measurement of the elements calcium, magnesium and alkalinity (KH) which are the basic foundation elements of coral skeletons. All of these elements need to be available in balanced proportions for sustainable successful coral health and growth.

This test kit enables accurate dosing of the Red Sea Reef Foundation Supplements, which are part of the complete Red Sea Reef Care Program.


Element Accuracy Test Type No. of Tests
Ca (Calcium) 5 ppm Titration 75
KH (Alkalinity) 0.05 meq/l Titration 75
Mg (Magnesium) 20 ppm Titration 60

Manufacturer information

With a dedicated team of scientists and other professionals, Red Sea is widely recognized as a leading innovator and manufacturer of quality products for aquarium hobbyists. Red Sea constantly strives to provide hobbyists of all levels with highly effective solution-driven products designed to make your fish-keeping experience as enjoyable and successful as possible.

The embodiment of Red Sea’s dedication to providing solutions for today’s reef-keepers is its range of MAX-NANO, MAX-E & MAX-S aquariums- The only choice for true Plug & Play™ coral reef aquariums, now featuring the very latest in LED lighting technology.

For advanced reef-keepers the Red Sea REEFER provides a great platform into which you can add your own selection of hardware. With its ultra-clear glass, ATO built-in, silent flow valve and superb quality of finish the REEFER sets the standard for those wishing to customize. REEFER is also available as a Deluxe version with LED lighting included.

Red Sea’s unique Reef Care Program (RCP) provides a comprehensive, safe and easy to use program for testing and supplementing within reef aquaria, and is perfectly complemented by Red Sea’s Coral Pro & Red Sea Salt’s, which has become the salt of choice for those seeking the very highest quality water quality for their coral reef aquariums. Both salts are made using a unique natural process which delivers unrivalled homogeneity and is perfect for delicate corals. Check your individual bucket of salt’s composition using Red Sea’s innovative new “MyBatch” software.

Whatever your aquatic needs, Red Sea delivers high quality innovative, solution based products.

5 Stars


Reviewed on
January 21, 2021

Yes, I would recommend this.

Good product

Pros: Good bang for your buck

Cons: Difficult to understand first time around

Good product for your money

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Reviewed on
November 28, 2020

Yes, I would recommend this.

Bought one

Pros: Sturdy casing

I had been using this in the past and always been happy with the results. Now that i got back in the hobby i just bought another one.

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Reviewed on
August 14, 2020

Yes, I would recommend this.

Great product!

Testing for Alk Mag and Ca is critical and this test kit is of great help.

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Reviewed on
June 12, 2020

Yes, I would recommend this.

Good kit

Pros: Accurate test results

Cons: None

I like this kit a lot better than others I’ve tried in the past. They can be a little more of a process but the results are more accurate.

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Reviewed on
June 05, 2020

Yes, I would recommend this.

Easy yo use

Pros: Straight forward.

Cons: none

Very simple to understand, and reliable.

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Reviewed on
August 09, 2017

Yes, I would recommend this.

Works great for me!

Give accurate measurements of Ca, Alk and Mg if you follow the instructions correctly.

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Reviewed on
July 14, 2017

Yes, I would recommend this.

Easy to use

The best test kits IMO. I have used others and prefer using these. They are easy to use and read.

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Reviewed on
March 19, 2017

No, I would not recommend this.

Bad product for me

Pros: Did manage to figure it out and make it work, so my $ wasn't totally wasted.

Cons: Cloudy directions, to many steps with obvious chances for error along the way.

To begin with the directions are foggy and the process is too long with the magnesium. You just get the feeling that the results are not going to be accurate by all the steps and all the chances for error along the way. Also, kit comes with these titration syringes with labeling that state they can only be used one time! So, basically you get one test for each element before you've got to find replacement syringes. Good luck finding these too. Will not be purchasing again.

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Reviewed on
March 11, 2015

Yes, I would recommend this.

easy to use!

Like it! Easy to use, however new syringe plunger is not for the better...I prefer the older style!

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eyal muallem

Reviewed on
March 27, 2014

No, I would not recommend this.


I tried to do the tests 5 times - watched the youtube Videos - and still i get a fault results - It takes to long to do the tests - I will not buy it again.

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