can I mix soil and rockwool chunks together ?

Would happy frog soil and rockwool chunks mixed together be a good growing medium?

Don't see why not.

I think that might stay too wet too long ,so ill say no.

The rockwool might throw off the ph.

Im pre treating the rockwool

Coco + rockwool + pu flakes = mapito. And its really good stuff. You'll just not be able to reuse it easy as mapito.And the ratio will matter a lot. There are many things we afraid to try. Life's just too short.