I would buy the K2006C from Amato Industries if it were me. That is the same kit as the 2006 but just has a larger bottle of some of the reagents. (I'll let Ben know that the 2006 is not shown as from Amato at this time like it was and hopefully will be again. Maybe they have just sold all they had in stock since we have been referring so many people to buy that kit!)

Regarding the distilled water ------ distilled water should have NOTHING in it. Tap water has fluoride in it, but distilled does not.

Lastly, regarding the pool ---- can you turn off the pump and let everything settle and then slowly vacuum to see if you can pick up whatever the silt is?