Just now filling our new pool and getting a little help from Mother Nature. Been filling the last three days and should be done this morning and we have had a half of a inch so far and should get a little more. My TF-100 test kit will not be here till August 1st. What is the best way to know what chemicals I will need at startup. I plan on turning on the pump today and start adding salt. Should I get a test at a local pool store? I don't really want to have to buy chemicals there but don't want to get a water test and run lol. Thanks in advance. MB