PHILADELPHIA 
Berkereia Bacteria Proof filters 
The cylinders of these fihers are composed of a special diatomaceous (fossil) 
earth obtained from the Kieselguhr Mines, in Germany. We are sole Pennsyl- 
vania agfents. 
No. 2574. With Double-wav No. 2574. Attached No. 2582. With Pump 
Cock attached to Spigot. to Spigot. and Flask. 
Household or Laboratory Filters for attachment to water supply for drinking 
cooking purposes. 
2574. H2 Filter. Capacity about i gallon in 3 to 5 minutes at ordinary pres- 
sure of 40 pounds. (Rate of delivery depends upon character of 
unfiltered water), nickel-plated, price . . $4 00 
2576. H^B. Capacity about i gallon in 2.) to 10 minutes, price ... 6 00 
2578. H,. " u J u u 3- u ^6 - 8 00 
2580. Double way cock and outlet pipe for obtaining unfiltered or filtered 
water at pleasure without removing filter (filtration upward), extra . 2 00 
Extra cylinders for above, with screw coupling , 1 50 
" •' " " " H,B 2 00 
" " " " " H, 2 50 
2582. Laboratory Filter and Mantle (without stand, flask or pump); 
can be connected to filter pump at spigot. 
Size I. Cylinder, 10 x 2 inches, price 5 25 
"II. " 8x1 " " 4 25 
" ni. " 2^ X I - " 2 00 
Cylinders Only, 
Size I. Price , . . 3 50 
"11. " 3 00 
" in. 1 25 
These filters are being extensively used in antitoxin and tuberculin manu- 
facture. 
For complete description and list of larger filters for hospital purposes and 
bacteriological reports, write for special pamphlet. 
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