My friends take order calls for this company. I wish I knew more to help you out, but I have looked through their in-print catalog which had a section for spa maintanence and everything you need to get started and keep it looking good.
http://www.poolgear.com/ - Pool Gear Plus
Also Pinch-a-Penny has some info in .pdf format
http://www.pinchapenny.com/guide/Flash/Pool_Care_Guide_2005_New.pdf
I couldn't find anything about that ring you had tho. Our spa doesn't have a timer. It does have an on-off switch so when it's on, the bubble jets are going and the filter is working. It has an automatic on-switch to turn on to maintain water temperature but that's it.
Sorry I couldn't be of more help.