Welcome to our forum.
The chems are a little confusing for the first few days.  After a week you'll feel  confident.  (Then after a couple weeks you'll realize you've screwed up the chem part the first 2 weeks and THEN really get it.  Someone called the first couple weeks "the mad scientist syndrome."  It happened to me - no big deal)
Our new optima will be here Friday morning. All is ready for its hook up. Â Any last minute advice ?