Sand on bottom and water is dull (not sparkling)?

[mjs31]

I have vacuumed the sand a couple of times now (not back into the filter) and it comes back. I am pretty sure this is a sandfilter issue. However, my water is also what I would call semi cloudy or dull. Could it be that small particles of sand from the filter is causing this? I have shocked without that helping but am trying again.

PH - 7.4
Chlorine - at shock level now. Typically keep it at 4-5
Bad Chlorine - 0
Stabilizer- 50
Alk - 90

I dont see any type of algie or anything similar, just sand. The sand is also mainly around the outer section of the 24' round pool. Basically the direction the return is blowing out.