Used 11.34 Square Feet Sparkler reverse flow filter, model 18S7RF, 316 stainless steel construction, rated 150 psi and full vacuum at 350 f internal, 304 stainless steel jacket rated 150 psi and full vacuum at 350 f, (7) 18" diameter shallow plates, rated 11.34 sq ft surface area, .414 cu ft cake capacity, serial# 23622, national board# 23622, new 2001.