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5 <br /> (com only no more than 120 lineal feet) and that even in <br /> the •st unfavorable , wet weather, only a portion of the <br /> trenc system becomes filled. For a soil requiring 60 <br /> minut-s to percolate one inch and a 4 bedroom home 640 lineal <br /> feet of 2 foot wide trench would be required to satisfy <br /> the anual of Septic Tank Practice . His records show that <br /> in ma y cases the cost of electro-osmosis is only slightly <br /> more than a conventional system. <br /> Mr. Nix Anderson reported installations in Wyoming <br /> soil hich had a percolation rate of hours per inch and are <br /> working perfectly. <br /> Illinois officials reported favorably on the first <br /> sys ten in that state. <br /> Some experiences seem too good to be true. Mr. <br /> Coolbroth made a Michigan installation at a site with a <br /> percolation rate of 2016 minutes per inch. Six weeks after <br /> • the s wage electro-osmosis system was installed he re-tested <br /> at thesame location and found the rate had increased to <br /> 30 mi utes per inch. <br /> • At a California state park, Mr. Jim Peterson made <br /> an installation after a conventional system failed. After <br /> 10 months the system is working perfectly and only about <br /> one-fourth of the installed seepage trench is actually in <br /> use . . <br /> To answer the question of whether the system will <br /> work in soils other than clay , Mr. Coolbroth made successful <br /> installations 3 years ago in a fine sand that had a <br /> percolation rate of 60 minutes per inch where the original , <br /> conventional system had failed. He installed only two forty <br /> foot seepage trenches . They have never found water in the <br /> second trench. <br /> Electrical Phenomenon <br /> f Mr. Coolbroth is learning much by his use of stainless <br /> steel probes which he drives into the soil and from which he <br /> meas res the magnitude of electrical potential and the <br /> dire tion of current flow. He also measures the soil' s <br /> resistivity to current flow. Study of natural potentials <br /> ?2.1,4 current aids in ..4-=-=:' ,77n ,-,f the system. Measurements of <br /> electrical _'psi_T v (",r'Y- closely with measurements <br /> of percolation _atfis , <br />