using pool filter sand as gravel?? water is mercy?

[Acura_RSX]

or if you have patience you can just wait .. it does settle by itself. with a filter hooked up on my 50 gallon it took about 3 days for mine to completely settle

 

[hydrophyte]

I wondered what the color of mercy could be.

It should clear after a few days. If you can run a filter with mature bio-media it might clear up fast.