Yellow-Brown Stain in the Deep End

Drsafety

Well-known member
Jul 8, 2011
77
Hello. I have been following the trouble free pool method since 2013 with success! Well, after adding a few 40 pound bags of salt, I have my first mystery. After the salt dissolved, I noticed a yellow-brown stain in the exact spot where the salt was dumped. I have tried brushing the stain away with no luck. The salt was Diamond Crystal (blue bag). Thoughts? Thanks!

FC 7
CC 0
PH 7.5
TA 70
CH 175
CYA 60
Salt 3400
 

Drsafety

Well-known member
Jul 8, 2011
77
Here’s my signature...
20 x 44.5 single roman end, ~33,000 gallons, 10 feet deep, garrett vinyl liner, Hayward SwimClear Cartridge Filter, Hayward 2 HP Pump, Cirrcupool RJ60 SWG, Hayward 140k BTU Heater, Polaris 380 with Booster Pump
 

JamesW

TFP Expert
Mar 2, 2011
21,058
It's a thing.