I bought a K-2006 test kit in May 2012 and used it to take care of my parents pool until mid summer 2013. The kit has been in their garage for 2 summers with little use. Dad said he added chlorine today, so I decided to test the FC level. Test came back clear, no change in water color. How long will the test chemicals last? Also he has drained the pool twice over the past two years and I am sure their is no CYA in it. I have not tested for CYA.