Not sure what your mystery is. Is it
1. Why is one step discolored and the others aren't... or...
2. What is discoloring the step... or...
3. Where is the sand coming from...?
Not sure what your mystery is. Is it
1. Why is one step discolored and the others aren't... or...
2. What is discoloring the step... or...
3. Where is the sand coming from...?
Try putting a vitamin C tablet on the stair and see what happens. It is definitely coming from your filter. The sand points to other issues. Let's go from there.
26K gal 20x40 rectangular IG vinyl pool; Apr 2014: New pump, liner, auto-cover, & water; Pentair Whisperflo 1HP pump; Pentair Trition sand filter; Cover/Star CS-500 auto cover; Taylor K-2006C; OTO
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