So our hot tub is 8 days old. Thus far according to the test strips, I've managed to keep ph, alkaline, and chlorine all in the proper ranges. It has also been treated with aquafinesse.
When I looked at it today in the daylight, I can see a greenish stain/ring on the inside of the tub near the waterline, all the way around. Is it normal to get a bit of that? Should I just scrub it off? It feels like it is on there well, just rubbing it with my fingers did not easily remove it.
Or is this a sign that despite the test strips, I need more chlorine? Or that it is due for a 'shock', high dose of chlorine??
Thanks!!!