Black specs?

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
10,829
Northern NJ

JamesW

TFP Expert
Mar 2, 2011
16,599
It looks like iron from iron particles.

Do you have anything rusty around the tub?

Try vitamin c on the spots.
 

Shirker

Well-known member
Jul 2, 2014
380
Athens, GA - USA
Pretty sure I've seen this before....

 

Ithacarun5

Member
Nov 8, 2019
14
Tampa
I'm pretty dang irritated with this hottub and am ready to sell it. My fill water is iron and metal heavy, I'm pretty sure that's my whole issue. This is like my 5th dang attempt. I'm going to run the water through a softener and 2 (new) massive house filters and fill with that, and add "Metal-Gon" before shocking. If these black spots show up again I quitttt!! Lol