Yellowish sediment

[Yelimex]

There are a few yellowish spots at the bottom of our pool. When I brush them, the sediment lifts and it seems that just settles in a different spot How do I get rid of it?

 

[PoolStored]

Might be pollen, vacuum it up.
Might be algae. Do an Overnight Chlorine Loss test tonight. Link-->Overnight Chlorine Loss Test
You fail you SLAM. Link-->SLAM Process
Post a full set of water test results: FC, CC, pH, TA, CH, CYA