Anyone know what would cause this staining - Jandy Light


Jun 11, 2015
So, I am seeing some stains that are around my Jandy LED light (JLU4C9W100) that is orange in color. The light is located in the raised spa. There are 2 other lights in the pool that do not have this issue. Anyone have an inkling on what would cause this issue? Is it rust?

I've tried to scrub it with the pool brush and it seems to help, but can't get it completely removed.

I test daily with TFT100 and keep it pretty balanced.

FC 2.5
CC 0
PH 8.2
TA 60
CYA 30
CSI 0.3



Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Your water is not pretty balanced. FC is low for CYA 30. See FC/CYA Chart. pH is high. CSI is high. No CH posted.

Your signature says you have a Nature2 system. That active? That puts minerals in your water. You could have staining from metals or minerals. Have you put any algaecide in the water or products with “blue” on the label?

What tablets are you using?