Welcome to our forum.
Does anyone follow the advice below?"When not using your spa, keep the Air Control Valves closed. These are the valves or dials on top of the spa that allow air to mix with the water coming out of your jets. Besides these valves letting cold air into the spa water and increasing heating costs, this air can also be full of air borne debris and algae spores that can cloud your water and increases your chemical usage. "What's you take on that advice?
I regularly give that advice and when I explain why (as you have done) I get their attention and I do believe it's generally followed.
Still giving hotair as advice eh? J/K good to see ur still kickin!
Good to see you back. I hope the letter I wrote your parole board helped gain you your release.