New pool owner here (vinyl, SWG) and so far water has been clear and no issues this season. Who knows what next year will bring but I’m curious to see if people buy supplies at the end of the season to stock pile for opening. Are there certain things that you 100% have to use each season? I’m sure this varies according to location, type of pool, and what issues arise come the spring. I’m seeing big markdowns on some pool chemicals so was wondering what folks do. Buy ahead knowing you’ll use them or just wait and see what you need?