I just had basement glass block windows istalled. Looking to cleanup/upgrade the window well "fill" material. What do I use and how much?

~ojt

I have used 2B marble.

The use of marble doesn't allow weeds/grasses to grow due to the nature of the marble,its acidic nature.

Only fill to the bottom of the window sill or less,water/snow,etc can build up ,much less debris.

KBC