Why is there dirt on The steps and swim outs in my pool?

The way you describe your problem sounds alittle familiar. Im know pool specialist but im trying to become on so ive picked up alittle bit of knowledge lately. As you mentioned you have changed the sand in your filter already which is the first step when you are getting dirt etc... back in your pool whilst the pump is running. Although you have changed the sand you may have put too small of a sand particle in your filter. I dont know much about EZO sand but it is a possibility that the sand had little clay particles attached to it and as the sand has become wet the clay has separated. Which could be causing the clay deposits in your pool. Your best bet is to find out from the person who installed the sand whether they have any problems like this happening. Also ask how fine the sand was, if its too fine a sand for the filter you have. The pump will just circulate it through your filter and pool which is not what you want. Hope this has helped alittle. I have had this problem in the past. When the sand was added to filter it is very important not to get any sand into the top tube. It must be covered. If sand gets in there it will certainly cause this problem. Also any cracks inside of filter will cause same thing.

It may be too, not enough sand was added to the filter, too much sand added or you may have a damaged lateral. These only if it is sand at the bottom of pool. Dirt and other small debris is another situation. If the latter, it could be a part of the b/w valve assy internal parts that are either loose or missing. On the other hand if you have a DE filter you may have some damaged grids. They have to be removed and replaced. The "dirt" is actually DE dust and fine particles of dirt that accumulates over the weeks or months.