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

Fig. 7. Detection of Phytophthora spp. in clean water reservoirs in relation to protection from recontamination and the quality of water stored: (A) detection of Phytophthora spp. in the clean water reservoirs (SSF = slow sand filter, LFG = lava grain filter).



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