Sanding lawn - which type of sand is best?

Normal sand, grain size 3 - 4mm

Sorry but I don't know any sand with a 4mm grain size, that is more like fine gravel.

I did the action 2 years ago, I mixed 70% sand from the [Bauhof], the ton for 24 gross and 30% soil.

Beforehand, I mowed the lawn as short as possible.

I distributed it with a self-made lawn scraper. It works great.

Only in spots that were deeper, the grass didn’t make it and I had to reseed.

Now after 2 years, it would have to be repeated because holes have formed again. But currently, I have no desire.

Thanks also for the tip about the drainage. We actually installed drainage pipes because the ground is extremely clayey and stony. Of course, they shouldn’t get clogged.

I wasn’t referring to the drainage pipes. Sand simply has a water-draining effect (called drainage). This is better the less it clogs and the more space there is between the grains.

Sorry, but I don’t know any sand with 4mm grain size, that’s more like fine gravel.

My local gravel plant still calls that sand

Ideal is washed quartz sand in the grain size 0-2mm