Courtney,

Here's where I get most of my refills--I've always been very happy with their prices and shipping.. http://www.spspools-spas.com . Is the brown stuff appearing to spread or multiply, or is it simply "there" with no obvious change? And is it on just the floor of your pool, or is it also on the sides? Usually algae will grow on the sides and then on the floor, but if it's dirt, it usually stays on the floor in mostly the same places every time.

Janet