Calcium test kit comparisons

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SW 20 & Over Club
Mar 15, 2004
Northeast PA
I compared the results I got using 3 different calcium test kits. I used a Lamotte, a Salifert and a Sera. I only did each test 1 time and followed each set of instructions the best I could.


Cost: aprox $40
Made in USA
It measures in increments of 10 ppm, has nice glass parts and easy to follow instructions. But, it's hard to tell when you reach the end color and you need to dilute the tank sample with distilled water (I used 0 TDS RO/DI water for the test). Also, the plunger it somewhat tricky to read. It goes up to 200 in increments of 4. If the plunger reads 80, your at 413 ppm, if 82 your 423, if 84 your 433, etc.
My result: 433 ppm


Cost: aprox $25
Made in Holland
It measures in increments of 10 ppm, it's easy to tell when you reached the end color and it has easy to follow instructions.
My result: 430 ppm


Cost: aprox $12
Made in Germany
It measures in increments of 20 ppm and it's hard to tell when you reach the end color.
My result: 440 ppm

I think Salifert is the easiest to use. I bought the LaMotte kit in 1991, used all the reagents and put it away. I just ordered refills ($16) to test it out. Once I use up these reagents (50 tests), it's getting put away The Sera kit is OK for a quick, cheap test.
Funny you mention this and perhaps just an oddity, but through my cheapy Nutrafin Calcium kit I get the same numbers as using a titrator at work (go figure). Anyways, I'd just stick with Salifert; however, have heard very good things about Elos :)
That's pretty sweet! It looks like the Salifert is about in the middle of the readings.
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