dpassar12 June 22, 2018 Share June 22, 2018 I have 2 Salifert ALK tests exp 9-22 and other is 11-22 The directions are different. Step 1 on both tests is 4 ml and 2 ml for low resolution. Step 2 on black and white directions 2 drops and 1 drop for low res. Step 2 on color directions is 4 drops and 2 drops for low res ? there is no difference in the drop solution bottles that I can tell. Of course I combined the packages becasue I bought them both at the same time... grrrr The ALK charts are the same as well... Link to comment Share on other sites More sharing options...
GraffitiSpotCorals June 22, 2018 Share June 22, 2018 Yea I was stumped by that as well, my new one says 2 drops. Old ones 4. Link to comment Share on other sites More sharing options...
ronl June 22, 2018 Share June 22, 2018 There are a couple of threads in Randy Holmes-Farley’s reef chemistry forum on R2R asking about this. Randy says it doesn’t matter and that the bottle in question is just a dye. Others said they got different results depending on whether they used 2 or 4 drops. I would try each kit based on the instructions included with each specific kit and see if the results are the same or different. Link to comment Share on other sites More sharing options...
dpassar12 June 22, 2018 Author Share June 22, 2018 no difference, maybe they changed to 4 drops to see the color change better... just ran 4 tests all of them were 8.4... Both packages claim 100-200 tests not sure how that is possible since everything is the same size.... Link to comment Share on other sites More sharing options...
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