Devon Posted October 25, 2010 Share Posted October 25, 2010 The strikers and the weather gods willing, I hope to install a Fosse Septique at my place in the Charente next month. I could do with a couple of pointers if anyone can help. It seems I should place a rock filter just after the tank outlet: can anyone tell me how the filter is installed and can they be bought off the shelf? Are the drainage pipes layed with a slight fall or level on the sand filter bed? How far below the finished ground level should the drainage pipes be? Thank's for any info in advance [:)] Link to comment Share on other sites More sharing options...
LesFlamands Posted October 25, 2010 Share Posted October 25, 2010 By rock filter I think you mean a 'prefiltre' which is usually a 500 litre chamber filled with 'Puzolene' lava rock in a basket which should be changed every 5 years or so. Sand filter pipes should or could have a very slight fall just to make sure they are not running back. Ideally all pipes should be 4-500 mm below the surface although depths are clearly specified for the sand filter. Spanc inspection is pretty basic - they usually check to see if you have the tank in level! Link to comment Share on other sites More sharing options...
pachapapa Posted October 25, 2010 Share Posted October 25, 2010 Practical simplicity...an FTE ( fosse toutes eaux) with préfiltre incorporated. Usually contains pouzzolane but maybe plastic balls. Link to comment Share on other sites More sharing options...
Devon Posted January 3, 2011 Author Share Posted January 3, 2011 [quote user="pachapapa"] Practical simplicity...an FTE ( fosse toutes eaux) with préfiltre incorporated. Usually contains pouzzolane but maybe plastic balls. [/quote] Thank's pachapapa. I installed an FTE. The job was fairly straight forward. Pipe depths for the drainage bed was set by the plastic access manholes supplied by a local builders merchant. I made one error by not using solid pipe from the upper manhole along to the 5 drainage trenches (1m down for the central trench) This was easily sorted. A spanc inspection I tried to arrange by email did not materialise but after a visit was arranged over the phone by a French speaking friend, the inspector was very helpful and did not have a problem with me covering the drains as I took photographs of all stages of the work. I left the top of the tank uncovered so the inspector could check the tank was level. The only other requirement was a vent stack venting just below the Fosse exit. Link to comment Share on other sites More sharing options...
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