Yellowing of hot tub outboard edge

OSUTeege

Member
Oct 24, 2021
5
Ohio
Pool Size
486
Chlorine
Liquid Chlorine
I am seeing yellow discoloration on a portion of the shell along the outboard edge of the tub. I am not seeing any staining on the cover nor is there buildup of any kind inside the tub at this area. In fact I am not seeing any staining inboard or outboard anywhere else on the tub.

Now this is an area where I do stand to add chemicals and I take extreme caution when adding chemicals (or so I thought). Chemicals added so far are dichlor, 7.5% bleach, dry acid and boric acid.

This is a brand new bullfrog x8, had for 1 month.

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F9BB5098-670E-440A-B419-4AAFAA3FE696.jpeg
BE4FFEC3-D9C4-44EE-ADB2-FF3A5F8A9678.jpeg
Any suggestions to clean this up?
 
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