Take the money you're saving at the pool store and buy a TF100 from TFtestkits.net. The link is in my signature. You're going to need it to complete the SLAM and you should have it anyways as it is your NUMBER 1 tool in your pool tool box! You will use the kit everyday until you get to know your pools diet of FC consumption. You've got that beautiful pool and it deserves to shine with a good reliable test kit. No one has ever regretted the purchase of their TF100. Not one member. They all don't know how they've faired without it, other than reporting green, cloudy water with test results from dip strips, cheap Wally World test kits and... Pool Store results.