Brown residue from SWG return

[uneasyrider]

I have a Coleman 22x52 AGP. Intex 16" Sand Filter, Intex QS1200 SWG.

I started noticing a brown residue building up around the rim of the output of the SWG. It's also present in the hose returning to the pool, and the inside of the jet.

The water doesn't seem to be affected. Chlorine, pH, Alkalinity, CYA are all within acceptable range. I did have a period where the pH and Alkalinity were very low, but they've been brought up to where they should be now.

Any tips for removing this?? Should I be adding something to my water to prevent this??

TIA

 

[SecoSteve]

Could be iron staining. Get some Vitamin C tablets and rub it on the stain. You could also crush some Vitamin C tablets in a sock and rub that sock on the stains. If it is iron, it will come off immediately.

 

[Texas Splash]

Welcome to TFP! Some pics might help. We should also start with a full set of water test results from either a TF-Series test kit (link in my signature) or Taylor K-2006C. Are you on a well?