This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
The water enters at A from the main into the bottom of chamber C, passes up through the filtering media, E E and F, and is collected in the top chamber H, being drawn off for use at G, the pipe to machinery being connected by a union to the cock G. The filtering media are periodically cleansed by turning off the cocks A and G and turning on B, thereby drawing the contents of the chamber H downwards through E E, and washing out all the impurities which have been left by the water passing in the opposite direction.
Fig. 27. - English High Pressure Filter.