Thanks for the reply. It's been a while since I've been here. It's nice to see some of the folks still here. I've been doing ok but have been battling health issues the last couple of years - just trying to persevere.

I'll read the article. It's easy to drain the spa, so that won't be a problem. The spa is outdoors but it is under a large oak tree and I always keep it covered with a cover when not in use, so I assume that I could treat it as an indoor spa.