Salifert Magnesium (MG) Test Kit
Original price was: $25.49.$19.61Current price is: $19.61.
Price: $25.49 - $19.61
(as of Oct 19, 2025 06:10:33 UTC – Details)
Salifert Magnesium Profit-Test Magnesium is present in natural sea water in a fairly high concentration (1350 – 1500 mg/L) and is an essential element of chlorophyll which is necessary for photosynthesis. Without photosynthesis plants, algae and coral would not be able to survive. Magnesium also helps to maintain the correct combination of calcium concentration and alkalinity as it slows down the formation of calcium carbonate which can absorb many important trace elements within the aquarium. Maintaining a correct magnesium concentration is therefore very important and is indirectly responsible for fast coral and calcareous algae growth by making it possible to maintain correct calcium and alkalinity figures. Magnesium is depleted by algae growth and also by the use of excessive kalkwasser or by going far beyond natural calcium, alkalinity and pH values. The Salifert Magnesium Profit-Test is easy to use and accurate with measurements in steps of 30 mg/L. Results are not affected by strontium and calcium interference. Can be used for marine water only. Calcium and strontium will not interfere when their total concentration is between 200 and 650 ppm. This is mostly the case. Up to 50 tests.Warning!Keep out of reach of children. Not for consumption.
Is Discontinued By Manufacturer : No
Product Dimensions : 5 x 5 x 4 inches; 2.4 ounces
Item model number : 8714079130422
Department : men, women
Date First Available : August 18, 2004
Manufacturer : Deepwater Aquatics Distribution
ASIN : B001EIYBKM
Best Sellers Rank: #22,137 in Pet Supplies (See Top 100 in Pet Supplies) #21 in Aquarium Test Kits
Customer Reviews: 4.5 4.5 out of 5 stars 1,015 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
The magnesium test kit effectively tests and provides a balanced magnesium aquarium
The magnesium test kit can perform up to 50 tests
The test will measure accurate steps of color change in tank
The Package Weight Of The Product Is 0.5 Pounds
Customers say
Customers find this magnesium test kit accurate and easy to use, with repeatable results and good value for money, particularly for saltwater tanks. The color change is obvious and easy to see, though some find the instructions unclear.
8 reviews for Salifert Magnesium (MG) Test Kit
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Original price was: $25.49.$19.61Current price is: $19.61.
R. Petersen –
Best magnesium test kit available
I run several marine aquariums. I manually test 6 parameters on each tank twice a week, have tried every single brand of test kits over the last 5 years or so, have owned automated testing systems (and found them completely inadequate and generally inaccurate), and routinely send in samples for ICPOES testing to confirm my manual results.This is clearly the most accurate hobbyist test currently available for magnesium. The test is easy to perform with a clear endpoint to the titration. Salifert recently shortened the test process by one step, making it even simpler to perform, without loss of accuracy.Some may be tempted to switch to the new Hanna magnesium checker. Don’t do it. Overall, Hanna makes great hobbyist checkers, and they are my first choice for several parameters. Unfortunately, not so for the Hanna magnesium checker, which consistently gives reading of about 100 ppm lower than the actual value. I was frankly stunned how badly they flubbed this one, considering how good their gear is overall.
Jone L –
Good quality
I often need to use the thing, my saltwater aquarium every week to test the water quality, easy to use, easy to operate.
Joshua1316 –
Easy to use
Great product, easy to use and accurate
dave sparks –
Makes testing easy
Quick and easy. Turns testing your water from a pain in the butt to easy peezie. A better test kit than most. Seems to be accurate too.
The Gawrons –
Saltwater aquarium necessity
Best inexpensive kit there is
William Mares –
Its okay gets the job done in 5 mins
Weird usage watch videos online to see how.
dewi –
PLEASE READ. May not work for typical freshwater tanks. Product box squashed when arrived.
Product box was squashed when arrived. It came inside an amazon paper bag with no padding. This item has liquids and a plastic mixing container. Amazon should have sent it in a box or padded paper bag.Despite poor shipping conditions, the product came in tact and no items were spilled or broken.*The critical issue is that the test will NOT work for freshwater tanks when magnesium levels are below 30ppm. MANY OWNERS WITH FRESHWATER TANKS TYPICALLY HAVE MAGNESIUM LEVELS WAY BELOW 30ppm.âA Google search will tell you thatplanted freshwater tanks should have MAGNESIUM levels around 5ppm but can be more (depending on you calcium to magnesium ratio).**the kit box and the amazon product description does NOT tell you the sensitivity range of test. THIS IS EXTREMELY IMPORTANT TO KNOW BEFORE YOU BUY THIS KIT (since most freshwater tanks do mot fall in the sensitivity range of this kit).â>This is why some reviewers complain that this kit does not work for them. This kit will work for saltwater tanks that typically have higher levels of magnesium but can work for freshwater tanks when magnesium levels are above 30ppm.ââTO CONFIRM IF THIS TEST WORKS WHEN YOU NOTICE THAT THE COLOR DOES NOT CHANGE TO PINK AFTER ADDING Mg-1. ââ1. Take 2 ml of freshwater from your tank and put it into the mixing vial that is provided with the kit.2. Add at least 1/64 teaspoon of epsom salt (magnesium sulfate). If you dont have a teaspoon that small you may still estimate using 1/8 of teaspoon. Regardless, 1/64 teaspoon is enough to create a positive test signal that is detectable by this kit. This mixture is your POSITIVE CONTROL where you have a high enough amount of magnesium to be detectable by this kit.3. Add 5 drops of Mg-1 reagent.4. VOILA! You should have a pink color. The Salifert magnesium test CAN detect magnesiumââunfortunately you may have already realized it can NOT detect magnesium in your freshwater tank, likely because your freshwater tank is below the sensitivity range of thisbkit. Thie Lowest Level of Quantification is listed in the instruction manual sensitivity chart (it is 30ppm).*****A Google search will tell you that there are Very Little options (or products) at this time for testing low levels of magnesium, which are typical for freshwater tanks.*****
a-mused –
Great Test for Mg in Saltwater – Must be shipped in a box, not bubble pack.
Easy and accurate for testing Magnesium in saltwater aquariums. I’ve used this for years and it’s excellent!That said, open your shipment *carefully* – doubly so if it arrives in a soft bubble-pack envelope. The box includes a red or pink removable tip for the reagent syringe. That tip can go missing if the box is crushed. It’s harder to go missing if it arrives in a box. Return the product *unused*, for a replacement if the tip is not present. It’s required for accurate testing!