I have read a lot of topics on the forum about pool dust and the consensus seems to be that the dust is actually algae. The problem in this pool seems to be exactly the same as the others have described, a brown thin silt evenly spread across the entire pool that dissapears when brushed. When filter vacuuming there is no evidence of anything coming in through the return lines, the pool is clean and then the next day there it is again. The home warranty company replaced the filter (hayward 250lb sand filter), and it hasn't helped at all. On Wedensday i vacuumed the pool as normal but this time i decided after vacuuming to shut the pool off for a couple days, to see what happened. The customer just texted me and said the pool is still clean after 2 days, whereas normally the dust is back the next day. SO i am trying to figure out what this means. I have had some suspicions that the pump was too large for the filter, the pump is a Waterway champion 1hp sf 1.65, with one inch and a half line. Am i right to think that this development confirms that the dust is not algae, or am i missing something? Thanks for the help.