Cloudy water when running vacuum

Aug 11, 2018
San Rafael
Having a fun new issue this season - so at the start of the season my pump died and algae bloomed. I got a new pump, drained the pool & cleaned out the algae, doused with chlorine, and things have been sparkling and clean ever since. However, for some reason now whenever I run my pool vac (Hayward AquaBug), the water gets cloudy. It always clears up by the next day. I suspect it's sand from the filter getting spit back out into the pool, though I'm not sure why it would ONLY happen when vacuuming if that is the case. The pressure seems fine, though even when I backwash+rinse it doesn't really go below the mid-yellow range.

Any advice on how to troubleshoot would be greatly appreciated.