I am a new pool owner and received a test kit from our pool contractor. I am using the Pentair, pool and spa test kit 78hr, which tests for chlorine, ph, acid demand and alkalinity. Is this test kit sufficient or do I need a test kit which tests for more or is more accurate? If there is a better test kit out there that anyone would recommend, I would greatly appreciate it. Our pool contractor will do a more extensive test if we bring them a water sample, but they are really far away and we don't make it there often.