New pool owner here of an intex 18"x4' above ground pool with salt water system. After lots of research I have decided that we may have mustard algae. I am basing this on the following: what looks like brown dirt settles in bottom of pool (scattered all over)...when I try to vacuum it up it just kinda disappears, also.....when I check my filter it is covered in a brown/mustardy looking slimy substance. Originally, I had thought maybe this was pollen but because it is slimy I'm thinking algae. PLEASE tell me how to go about getting rid of this. Please remember I'm new to this so can you please be specific. Thank you!