Following the instruction, the mixed solution is always more than enough to do the black dot test. Can I do it with half of the water and solution? This should result the same ratio to test with.
My other question is, seeing the guy at the pool store using the same test but since it's indoor (the black dot probably don't appear as dark), his result should be higher than when I do the test out in the backyard, correct?
I asked because my recent test showed 70 and the pool store's was 40, reversed of what I mentioned above.