This the second season with our new pool. We have had fine brown sediment on the pool floor this entire summer. The sediment can be "kicked up" and the floor of the pool looks clean. The sediment was not being filtered by our vacuum (using the pool filter) so we purchased a robotic vacuum which actually works quite well. However, two days later most of the sediment is back. PLEASE HELP!!! What do we need to do to get rid of this? We will need to close the pool for the winter soon. I'm afraid of what the pool might look like when we open it next spiring. Thank you for your time!!! rsk111