You need to use the full 44ml on the pH test. Also, the CYA test is 7ml of water and 7ml of R-0013.

On the chlorine tests, if you use the 10mL or the 25mL test either one, you only have to add one scoop of powder. If one scoop doesn't turn the water pink, you can add the second one.

On the other tests since I don't run them too often, I typically just use the 25mL sample. But, if you think your TA or CH are very high, on the bottom of that test's directions inside the K-2006 lid, it tells you how to use a 10mL sample instead.