Depth
Filtration
Normal
Semi Depth
Depth
Type of Filter
Depth Filter :
• commonly used to remove high dirt
contamination, such as for the first filtration
process.
• Pall’s Depth Filter provide a wide range of pore
size that would be compatible for a broad
spectrum of sample. The membrane of filter can
be double or single layer, but for the better
performances we suggested to used double
layer.
• The membrane is thicker than the “normal”
filter.
Type of Depth
Modules
Sheets
Typical Depth Sheet Filter Materials
 Cellulose fibres
 extremely fine
three dimensional sieve
 large internal surface area
(void volume of 70-85 %)
 Filter aid
 Diatomaceous earth
 permeable, fine matrix
 Perlite - bulky, flaky particles
 Microfine cellulose
 Synthetic polymer
 positive zeta potential
 wet strength
Trial
Filter
Format
Scale-Up Filter Format
Double
Layer
SUPRAdisc HP Graded Sheets
Combination
Media Type Top sheet – bottom sheet
Application
PDK5
K 900 P - K100P
Post Fermenter
PDH4
K 700 P - KS 50 P
Post Fermenter
PDE2
K 100 P - EKM-P
Post Centrifuge
PDD1
KS 50 P – EKS-P
Post Centrifuge / Post TFF
Top sheet - Coarse grade
Bottom sheet - Fine grade
Drainage plate
Bottom sheet - Fine grade
Top sheet - Coarse grade