I found my old but never used TF-100 test kit from around 8-9 years ago minus the K-1000. Are the chemicals still good and can I use it or should I buy a new one. I'm looking to utilize the info on this site to keep my wife and I out of the pool store and to get a better understanding at keeping a clear pool. If I need to buy a new test kit, which one does everyone recommend? Thanks!