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Anybody Know:

I have an AP Calcium Test Kit--Saltwater

The only difference between the Saltwater kit that I have and the Freshwater Kit on Drs.F&S is: For the saltwater add 10drops of Solution #1 and 19 drops for the Freshwater.

Here are the Freshwater Instructions:

Directions for Testing Calcium:
Measures calcium levels as low as 20 mg/L.
Read thoroughly before testing. Do not allow test solution to get into aquarium.

To remove childproof safety cap: With one hand, push red tab left with thumb while unscrewing cap with free hand.

1. Rinse a clean test tube with water to be tested.
2. Fill the test tube to the line on the test tube with the water being tested.
3. Holding the bottle vertically, add 19 drops of Calcium Test Solution #1 to the test tube, cap the test tube, and shake for 10 seconds.
4. Shake calcium Test Solution #2 bottle vigorously for 10 seconds,
5. Holding the bottle vertically, add Calcium Test Solution #2 drop by drop to the test tube until the solution changes from pink to the blue end-point.
6. Be sure to count the drops added.
* A pink color should form after the first drop.
* If a blue color forms after the first drop, the calcium concentration is 20 mg/L or below.
7. As the end point is approached, the color will usually change from pink to purple before finally changing to blue.
The Bottles are exactly the same:

Aquarium Pharmaceuticals Freshwater Calcium Test Kit

I've tried it by both sets of instructions on both hard and soft water and the results are exactly the same--and are way off.

Anybody have any thoughts on this?
 
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