... unique V-SLOT filter element, which can be back-flushed clean thoroughly and costs less of back-flushing liquid. When ... V series external fluid back-flushing type, using the external clean fluid (liquid or gas) to flush one filter unit. ... gasoline, naphtha, FCC, AGO, CGO, VGO, raw water, process water, clean white water, cooling circulating water, spraying water, squirt water etc. Filtration ...