300 Missouri AgricnUiiral Kcport. 



tweeii the tank and the tile system. If conditions will permit, it is 

 desirable in heavy soils to lay two lines of drain tile about thirty 

 inches in depth as shown in Fig. 5. These drain tiles, not absolutely 

 necessary, if they have a proper outlet would obviate the danger 

 of the filter not working during the rainy period, when the 'soil is 

 saturated with water. It is advisable in a cold climate to cover the 

 filter with manure or a heavy mulch. Where the building location is 

 flat it w^ould be necessary to construct the tank above the general level 

 of the surface as it would discharge from the bottom. 



SEPTIC TANK AT N. W. EXPERIMENT FARM. 



A tank as shown in Fig. 2 was constructed at the Northwest Ex- 

 periment Farm at Crookston, Minn. The discharge is through a tile 

 drain with outlet in an open ditch three hundred feet from the house. 

 The tank is pb.ced within three feet of the house foundation. It has 

 been working for two years and is entirely satisfactory. Its original 

 cost was $18.65. The tile drain had previously been constructed for 

 general drainage purposes. Details of cost items and the method of 

 constructing this tank are given on pages 79 to 81, of bulletin No. 110, 

 of the Minnesota Experiment Station. A tank with a sand filter would 

 require in addition to the tank as shown in Fig. 2, an additional tank 

 double the size of the last chamber, to serve as a receptacle for the 

 sand and gravel filter. 



A tile filter system, Fig. 4, requires the construction in addition to 

 the tank, of the tile filter system and the automatic valve, the valve 

 alone costing from $20 to 25. 



One of these plans will be found suitable for almost any location 

 and there is now no reason why isolated houses cannot be fitted with 

 modern plumbing and the house sewage disposed of in a sanitary 

 manner. 



