In the case of strongly absorbing test materials, 1,5 litres of supernatant liquid only are drawn from the settling vessels and poured into the activated sludge vessel of the other unit.
Tugevalt absorbeerivate testmaterjalide puhul võetakse setitusnõu pinnalt 1,5 1 supernatanti ning valatakse see teise seadme aktiivmudanõusse.