Sand filter - correct sand depth?

[tomfrh]

I’m deep cleaning my sand filter at the moment. onga pantera II p25 filter. It’s a standard spherical filter.

It has zeolite in it.

ive cleaned it and it looks a little low now. A little over half full.

how full should it be?

 

[Texas Splash]

If you don't have the manual to specify, generally they are about 2/3 - 3/4 full.

 

[tomfrh]

Thank you.

the manual gives total kg quantity of sand or zelbrite, but doesn’t appear to specify a level, which is what I need since I’m topping up.