Re: Magnesium Kit readings
By filling to the top we mean to the very top of the vial. All the way to very very the top.
The Mg reading may indeed be off if the filtrate was not clear. You might try packing the filtering fiber a little tighter into the base of the funnel. If you run into the filtrate not being clear you can also just pour it back into the filtering funnel to make a second pass. This usually clears it up. You need for the filtrate to be clear to get a good reading.
Go ahead and fill to the 5 ml line even though it is a little more. The kit is based on this cylinder at that level. So, though it is not 5 ml, you should still use that line as the mark for the amount of sample.
BTW, they are not silly questions. They are actually quite good. I'd much rather you ask and feel comfortable using the product long term. : )