Greenish ring around tub near surface?

[Gibson00]

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!!!

[av8r]

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!!!

Sounds like what we had around the same time.  Greenish/Brownish line.  I did some research and it seemed to be a very common complaint among new spa owners.  I super chlorinated, cleaned up the crap with a magic eraser and it never returned.  From what I read it's attributed to metals in the fill water and things in the plumbing from the manufacturing processes.

If you can get your water tested at a dealer who can test for TDS and metals you may find there are metals in there that can be taken out of suspension with a stain and scale treatment.

[Gibson00]

Thanks!  Think we are going for a quick soak tonight.  Then I think I will shock it and try wiping it off.

[BullFrogSpasMN]

no biggie, as stated above it is simply the small amounts of metal coming to the surface....Mr. Clean Magic Eraser, those little suckers work like a charm for wiping it off, I use them in the showroom all the time