So, I've decided to deep clean my sand filter since 1) it's never been done since I built the pool 6 years ago and 2) I seem to have a pollen problem that I'm having trouble getting rid of. So, when I opened the filter, this is what I saw...
What is this thing and how do I remove it in order to clean the sand?
Also, as far as I could see, it didn't look like there was much sand in there...maybe half full.
Shouldn't there be more sand than this in there?
TIA for your help!

What is this thing and how do I remove it in order to clean the sand?
Also, as far as I could see, it didn't look like there was much sand in there...maybe half full.

Shouldn't there be more sand than this in there?
TIA for your help!