TY - JOUR
AU - Ventre, Emil K.
AB - By EMIL K. VENTRE! The cleaning of sand presents a problem very much like the removal of scale or incrustants from a boiler or evaporator. It has been for many years standard practice in the sugar and like industries to clean heaters, evaporators and vacuum pans of scale by an acid and caustic soda treatment. A slight modification of the method enables the cleaning of sand and gravel to the extent that I believe by twice a year cleaning a filter may be operated indefinitely with only the addi- tion of sand for that washed way. . In the use of alum treatment with a water high in organic matter a caustic soda treatment suffices. Where the pH of filter influent is neutrality or slightly below and where some of the trouble is due to the incorporation of unicellular algae and protozoa, similar use may be made thereof. The strength of solution to be used can best be determined by individual experiment on sand in the laboratory and a check may be had on the tubes by submerging piece of same in solution for the time the solution is to be left in the filter. I have used the 
TI - A Practical Method of Cleaning Filter Sand
JF - Journal - American Water Works Association
DO - 10.1002/j.1551-8833.1929.tb17020.x
DA - 1929-11-01
UR - https://www.deepdyve.com/lp/wiley/a-practical-method-of-cleaning-filter-sand-3ofnNI1W0b
SP - 1523
EP - 1524
VL - 21
IS - 11
DP - DeepDyve
ER -