Pool color, can someone explain this?

[xanadu007]

I have a light blue pebble. However, before doing a water change it looked more 'teal' color. I drained and refilled the pool and it then had a more blue color - nice. BUT, as soon as I added salt, it went back to more of a teal color. These changes are subtle but clearly noticeable. Before adding salt, I added calcium, stabilizer, and tetraborate. It still looked more bluish until adding salt. Can one of you chemical jockeys explain this or am I nuts.

 

[proavia]

Post a full set of current test results from one of the recommended test kits.
Test Kits Compared

FC
CC
pH
TA
CH
CYA
Salt
Water temperature

What is the ph, TA and CH of your fill water?

Why did you add borax?

 

[JamesW]

Maybe iron in the salt added yellow to the water or plaster as a stain.

 

[JoyfulNoise]

Saltwater has a higher density and refractive index than fresh water. Salt also adds impurities to the pool water. All of these factors can affect the perceived color of the pool water. I can confirm that I have seen this effect in my own pool as well - freshly filled pool water seems more blue and clear then, when chemicals are added like salt, CYA and borates, the water becomes more teal. It’s totally normal.