This is my first pool & I have a Intex Ultra Frame 18'x48" AG pool (Setting up tomorrow) I did originally buy test strip for chemical checks. I know absolutely nothing about pool chemicals, their quantities, how to maintain levels etc. After browsing and studying TFP website Im more aware of the levels that are needed and how to calculate what to put in etc. Knowing this now and reading the forums I know the test strips will not work (ie CYA level is 'ok' for 50-100; in actuality it should be 30-50) I realized the test kiss are much better getting accurate readings to user in pool calculator to determine what chemicals to add and how much instead of a guesstimate. I researched different testing kits and the TF-100 is the best one I've come across. With all the extra readagent Oz & extra tests is worth the money I think..... my question is how long will the kit last before you have to buy refills????? I know it depends on how much you test.. this is a new pool so I'll be testing everyday for a couple weeks to get water balanced, then Regular maintenance and testing weekly.