silt in chamber dome type lines

[hockeyologist]

Has Anyone Dug Into Any Older Exsisting Field Lines To Repair Or Add On To Only To Find Chambers Filled 1/2 Full Of Silt Or Sand , Is This A Problem Only In Sandy Soils And How Does It Get There , Will Fabric Cover Help ????

[dawzie]

Are you sure it's sand and not carry over/sludge from the tank that has dried out?
If it is sand I would assume that not enough hay or no fabric was used over the trenches.
How old of a system is it?
What State is in installed in? Just wondering if freeze/thaw is causing a problem.