Column elution unit for the elution of soil samples behrotest® Column elution un t: Column elution acc. to LUA recommendations with adjustable-speed 4-channel pe istaltic pump. The unit consists of: - system stand - adjustable-speed, 4-channe peristaltic pump - supply container, 20 litres - 4 elution columns, inside diame er 6 cm, 32 cm long, with 2 threaded openings (GL 45, with Teflon inserts) to si plify filling the columns - 4 x 2 litre drip collectors for column eluate with t readed opening (GL 45) and vent - Tygon and PVC supply tubing with check-valve i column supply line - Teflon tubing lines between columns and drip collectors -f column supply line - Teflon tubing lines between columns and drip collectors -f all 4 channels Quartz sand behrotest® : for column elution unit, grain diameter