I just sank a brand new Dolphin Oasis Z5 in the pool and let it do its thing. Here is the exec summary:
Pool is only one month old.
I had talked to PB about cancelling the Pentair 'Racer' pressure-side cleaner that they supply, in favor of a Dolphin, but they said "you won't need it."
Since then, we have had fine gold-colored sand or silt in the pool everyday, even after running the Racer three hours a day, even with all pumps on 'High'.
My wife and I have had to brush the silt or whatever towards the drains, but it still seemed to gather around the drains, instead of going into the drains and to the filter.
Bottom line - There were brown silt patches in our pool, despite the cleaner running three hours daily and all of our brushing.
Today - put the Dolphin in, as I always suspected we would need. No comparison. When it was done, I had no silt in pool, all four cartridges had about an inch of silt, that I easily sprayed out. And the kicker is, I only used the mesh cartridges. No telling what the pleated cartridges will find.