I am considering a quote on a pool and the pool builder is charging $325 for chemicals after it is filled. The pool will be filled then not used until next year since it won't be complete until October. Is $325 reasonable and should I just expect that for a 18x36 rectangle with an 8' deep end? Should the pool be brought to full swim chemicals before wintering over? We plan on using the BBB method and we will not have salt.