Odd stains

[snj2k2se]

Is there a tree near the pool? I have a large Maple tree in my back yard that drops some unknown substance (sap?) into the pool periodically. It leaves stains like you describe on the bottom that can't be brushed off.

What I've found to work is letting the water get very still and sprinkling Cal-Hypo directly over the stains. Wait 5 minutes and the stains brush right off. I have a plaster pool so I don't have to worry about bleaching out a liner.

I also have converted to the BBB method this year but still keep some Cal-Hypo around for this reason.

[DogPaddle]

Derrik--we have similar staining in our gunite pool and I attribute it to lawn chemicals. Back in the spring my hubby was broadcasting lawn food granules and though he SAID he didn't get any in the pool , the very next day the stains appeared. They have been there ever since and no amount of scrubbing, etc. will take them off. (I also noticed similar staining of our concrete driveway and sidewalk. ) Hopefully they will eventually fade. (The upside is that we have a very attractive green lawn. )