foam in our pool

Help ! When we run our filter there is a foam on the surface...we use bacquacil and a sand filter the sand has just been changed

I had the same problem yeasterday, and I use baquacil and a sand filter. I hope to find a cure soon!

I've always seen a higher occurance of bubbles and foam when putting in the biguanide and clarifier. If all your levels are normal, I wouldn't be too alarmed.