Answer: Hana collects the ocean water that passes through the filter.
Explanation;
When the Hana fills allows the sandy ocean mixture through a filter she will observe that, the sand particles present in the mixture getting collected on the filter and the water seeping down through the pores of the filter. This process followed by Hana is known as filtration process (as shown in figure attached).
In the end, Hana will be able collect the ocean water without sand present in it.