Need some help with brown stains

Apr 12, 2016
23
tampa, fl
It's been a while since I've posted. I have some brown stains in my pool that will rub off with my hand but not with VIGOROUS scrubbing with nylon brush. Stains are also completely eliminated with vitamin c tablet. Passed 3 OCLT tests and pool is clear. Any ideas? Would a (light) iron stain rub off with your hand?
 
Do you use well water in your pool? What are your most current set of test results? It seems odd it would rub off with your hand but not brush off. You could try adding some sequestrant and see if the stains lift.
 
Thanks for the quick reply. I have city water but I dont use a softener. Would algae stains rub off with your hand and not a brush? I use only nylon not steel, if that makes a difference. This was as of last night:
Fc 5.8
Cya 80
Salt 3400
Ph 7.5
 
Thread Status
Hello , This thread has been inactive for over 60 days. New postings here are unlikely to be seen or responded to by other members. For better visibility, consider Starting A New Thread.