Hi This is our third year with our in-ground pool. The pool store in our town is wonderful, as in any pool store they will test our water, for free, and advise what needs to be added. This always works. My question is, since I have been reading this forum and pouring over this website, I see a lot of people testing their own water with home test kits. Some seem so fancy. Is this necessary? If the test strips show me my chlorine level, isn't it ok to just bring a sample to the pool store occasionally to see if it needs tweaking?