Polished natural gravel free of dust and moisture, does not change the water parameters.

Polished natural gravel free of dust and moisture, does not change the water parameters.

Dust-free and harmless artificial gravel, which does not change the water parameters.

Dust-free and harmless artificial gravel, which does not change the water parameters.

Dust-free and harmless artificial gravel, which does not change the water parameters.

Dust-free and harmless artificial gravel, which does not change the water parameters.