Sand and Gravel water filter- HELP
Okay so I have been charged with finding out how to build a simple sand/ gravel water filter for use at scouts on Thursday and I have come up with ZERO... Does anyone know enough about it to explain to me in laymans terms on how to construct one... or rather what grades of sand/gravel i need?
I'm planning on using a pop bottle, and layering the sand and gravel inside it.... using the screw top end as the tap.... I have a BASIC idea of what i need... I just want to be sure it works!
Thanks guys and girls