AQUARIUM FILTER SIZE

Automatic Sand Filter

sand filter


A filter used in water purification and consisting of layers of sand arranged with coarseness of texture increasing downward


Sand filters are used for water purification. There are three main types; # rapid (gravity) sand filters # upflow sand filters # slow sand filters


(sand filters) Devices that remove some suspended solids from sewage. Air and bacteria decompose additional wastes filtering through the sand so that cleaner water drains from the bed.


The oldest and most basic filtration process, which generally uses two grades of sand (coarse and fine) for turbidity removal or as a first stage roughing filter or pre-filter in more complex processing systems.

automatic


operating with minimal human intervention; independent of external control; "automatic transmission"; "a budget deficit that caused automatic spending cuts"


(of a motor vehicle or its transmission) Using gears that shift by themselves according to speed and acceleration


automatic rifle: light machine gun


automatic pistol: a pistol that will keep firing until the ammunition is gone or the trigger is released


(of a device or process) Working by itself with little or no direct human control


(of a firearm) Self-loading and able to fire continuously until the ammunition is exhausted or the pressure on the trigger is released