AUTOMATIC SAND FILTER : WATERCO SAND FILTER : IR FILTER DIGITAL CAMERA.
Automatic 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.
- 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
Effluent Polishing Pond 9-20-2011 #263
I took a photo of the sand filters a while back. This is the process that immediately precedes them, and from which they're dosed. The "dosing tank" is in the foreground, filling. Once it reaches a certain height an automatic siphon doses one of the two sand filters for further polishing prior to the disinfection and discharge into the receiving stream. On the surface of the pond is a vast expanse of "duck weed," which is appropriate if you look carefully.
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