Filtration to Eliminate <i>Phytophthora</i> spp. from Recirculating Water Systems in Commercial Nurseries

Fig. 4. Average volumes filtered during 2003-2006 by the four nurseries in the study (SSF = slow sand filtration, LGF = lava grain filtration). (B) Average monthly volumes of filtered water produced by SSF 1, SSF 2 and LGF 2003-2006. (Data for LGF not available for 2004 due to technical defect in the measuring unit. Error bars show maximum volumes.)



Image from Plant Health Progress article:
Filtration to Eliminate Phytophthora spp. from Recirculating Water Systems in Commercial Nurseries