‘weir flow

What diameter of outlet tube does a biosand filter use?

The early versions of the biosand filter (v8 and earlier) used a ½” PVC pipe for the outlet tubing.  This is essentially ‘weir flow,’ meaning that the water will exit through the tubing until the water level drops to the same level as the bottom of the upper bend in the pipe (see the first diagram below). 

Subscribe to RSS - ‘weir flow