"clean sand" is correct and usable in written English.
You can use it to describe sand that is free from dirt and other impurities. For example, "We filled buckets with clean sand from the shoreline."
Silica is obtained from clean sand.
All filled with clean sand, at any rate above.
Dr. Kostka dug a trench and took samples from oily and relatively clean sand.
It's a fabulous spot: a great sweep of clean sand backed by cave-riddled cliffs.
These horizons were sometimes found under more than 3 m of clean sand.
Put a layer of fine washed gravel or clean sand (we use the sand for children's sandpits) on the bottom.
Create a seal around the base of the pit, before covering the whole pit with clean sand.
A preference was observed for clean sand during the summer, but no preference was observed for sand during the winter.
Pumping experiments conducted through clean sand in RBF indicated that PhACs were highly mobile with minimal degradation.
The frozen sampling (FS) method is useful for dynamic strength and deformation tests of undisturbed clean sand.
